Fetch data from database based on checkbox on button click

Fetch data from database based on checkbox on button click - c#

I have table consisting columns(....,....,....,BLOCK) in my database.
The BLOCK column has bit datatype(True,False).
When BLOCK column has False, the data should be fetched from the database.
When BLOCK column has True, the data should not be fetched resulting in throwing an error.
When I give the name of a particular person in textbox and click button, the above operation must be performed
my button click c# coding is...
protected void ImageButton5_Click(object sender, ImageClickEventArgs e)
{
string selectsql = "SELECT * FROM UserDetailsTwo";
using (SqlConnection con = new SqlConnection(#"Data Source=ENTERKEY001;Initial Catalog=ContactManagement;Integrated Security=True"))//DataBase Connection
{
SqlCommand selectCommand = new SqlCommand(selectsql, con);
con.Open();
SqlDataReader SelectReader = selectCommand.ExecuteReader();
while (SelectReader.Read())
{
Boolean BLOCK = Convert.ToBoolean(SelectReader["BLOCK"]);
if (BLOCK == false)
{
//con.Open();
SqlCommand cmd = con.CreateCommand();
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "SearchUser";
cmd.Parameters.AddWithValue("#NAME", TextBox4.Text.Trim());
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
GridView1.DataSource = dt;
GridView1.DataBind();
con.Close();
}
else
{
Response.Write("Error");
}
}
SelectReader.Close();
}
}

You are trying to use an SQLDataReader like a DataAdapter.
SelectReader = selectCommand.ExecuteReader();
while (SelectReader.Read())
{
Int64 BLOCK = Convert.ToInt64(SelectReader["BLOCK"]);
if (BLOCK == false)
{
con.Open();
SqlCommand cmd = con.CreateCommand();
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "SearchUser";
cmd.Parameters.AddWithValue("#NAME", TextBox4.Text.Trim());
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
GridView1.DataBind();
con.Close();
}
else
{
Response.Write("Error");
}
}
https://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqldatareader%28v=vs.110%29.aspx

Related

How to retrieve data from postgres to textbox in c#.net

I want to retrieve data from postgres db into textbox in C# without using grid.
Here is the running successful code by using grid which I had tried:
connection.Open();
NpgsqlCommand cmd = new NpgsqlCommand();
cmd.Connection = connection;
cmd.CommandText = "SELECT * FROM student_folio";
cmd.CommandType = CommandType.Text;
NpgsqlDataAdapter da = new NpgsqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
cmd.Dispose();
connection.Close();
GridView1.DataSource = dt;
GridView1.DataBind();
I get error when build when I want to retrieve it into textbox:
"cannot apply indexing with [] to an expression of type 'NpgsqlDataAdapter'"
Here is my block of code:
connection.Open();
NpgsqlCommand cmd = new NpgsqlCommand();
cmd.Connection = connection;
cmd.CommandText = ("SELECT f_name FROM student_folio WHERE id = 1");
cmd.CommandType = CommandType.Text;
NpgsqlDataAdapter da = new NpgsqlDataAdapter(cmd);
txtFname.Text = da["f_name"].ToString();
cmd.ExecuteNonQuery();
cmd.Dispose();
connection.Close();

A DataAdapter is not an array of rows you can loop into.
Look at your first code block : you must fill a DataTable from your adapter and then read through the Rows property of this DataTable.
NpgsqlDataAdapter da = new NpgsqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
if (dt.Rows.Count > 0)
{
txtFname.Text = dt.Rows[0]["f_name"].ToString();
}
You could also do this :
foreach (System.Data.DataRow row in dt.Rows)
{
txtFname.Text = row["f_name"].ToString();
}
And please, remove the cmd.ExecuteNonQuery(); line, it is useless here

try this . .
connection.Open();
NpgsqlCommand cmd = new NpgsqlCommand();
NpgsqlDataReader dr=null;
cmd.Connection = connection;
cmd.CommandText = ("SELECT f_name FROM student_folio WHERE id = 1");
cmd.CommandType = CommandType.Text;
dr=cmd.ExecuteReader();
while(dr.HasRows)
{
while(dr.Read())
{
txtFname.Text = da["f_name"].ToString();
}
}
connection.Close();

How to filter results in datagridview combobox based on combobox outside datagridview

I am trying to use the datagridview to input multiple data into sql, but I am having a hard time to bind the datagridview combobox to show items based on the selected item in the combobox (supplier), I can't even bind my sql in the datagridview combobox, sorry for being a noob, but I am trying to finish this project. the code below is the code that I use, it is based on individual comboboxes and textbox and not binded on datagridview.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
using Inventory.Properties;
namespace Inventory
{
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}
SqlConnection conn = new SqlConnection(#"Data Source=MEDIXPC197;Initial Catalog=Inventory;Integrated Security=True");
SqlCommand cd = new SqlCommand();
private void label15_Click(object sender, EventArgs e)
{
}
private void Form2_Load(object sender, EventArgs e)
{
// TODO: This line of code loads data into the 'inventoryDataSet.dbTrans' table. You can move, or remove it, as needed.
this.dbTransTableAdapter.Fill(this.inventoryDataSet.dbTrans);
cc();
cc2();
cc3();
}
public void cc()
{
conn.Open();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "SELECT Department from tbldept";
cmd.ExecuteNonQuery();
DataTable dt = new DataTable();
SqlDataAdapter Da = new SqlDataAdapter(cmd);
Da.Fill(dt);
foreach (DataRow dr in dt.Rows)
{
comboBox1.Items.Add(dr["Department"].ToString());
comboBox2.Items.Add(dr["Department"].ToString());
}
conn.Close();
}
public void cc2()
{
conn.Open();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "select distinct Supplier from tblmaster";
cmd.ExecuteNonQuery();
DataTable dt = new DataTable();
SqlDataAdapter Da = new SqlDataAdapter(cmd);
Da.Fill(dt);
foreach (DataRow dr in dt.Rows)
{
comboBox3.Items.Add(dr["Supplier"].ToString());
}
conn.Close();
}
public void cc3()
{
conn.Open();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "SELECT [Transaction] from [tbltransac]";
cmd.ExecuteNonQuery();
DataTable dt = new DataTable();
SqlDataAdapter Da = new SqlDataAdapter(cmd);
Da.Fill(dt);
foreach (DataRow dr in dt.Rows)
{
comboBox4.Items.Add(dr["Transaction"].ToString());
}
conn.Close();
}
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
conn.Open();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "select * from tbldept where Department = '" + comboBox1.SelectedItem.ToString() + "'";
cmd.ExecuteNonQuery();
DataTable dt = new DataTable();
SqlDataReader dr = cmd.ExecuteReader();
SqlDataAdapter Da = new SqlDataAdapter(cmd);
conn.Close();
}
private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
{
conn.Open();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "select * from tbldept where Department = '" + comboBox2.SelectedItem.ToString() + "'";
cmd.ExecuteNonQuery();
DataTable dt = new DataTable();
SqlDataReader dr = cmd.ExecuteReader();
SqlDataAdapter Da = new SqlDataAdapter(cmd);
conn.Close();
}
private void comboBox3_SelectedIndexChanged(object sender, EventArgs e)
{
conn.Open();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "select * from tblmaster where Supplier = '" + comboBox3.SelectedItem.ToString() + "'";
cmd.ExecuteNonQuery();
DataTable dt = new DataTable();
SqlDataAdapter Da = new SqlDataAdapter(cmd);
Da.Fill(dt);
comboBox5.Items.Clear();
foreach (DataRow dr in dt.Rows)
{
comboBox5.Items.Add(dr["ProductCode"].ToString());
}
conn.Close();
}
private void comboBox4_SelectedIndexChanged(object sender, EventArgs e)
{
conn.Open();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "select * from [tbltransac] where [Transaction] = '" + comboBox4.SelectedItem.ToString() + "'";
cmd.ExecuteNonQuery();
DataTable dt = new DataTable();
SqlDataAdapter Da = new SqlDataAdapter(cmd);
conn.Close();
}
private void comboBox5_SelectedIndexChanged(object sender, EventArgs e)
{
conn.Open();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "select * from tblmaster where ProductCode = '" + comboBox5.SelectedItem.ToString() + "'";
cmd.ExecuteNonQuery();
DataTable dt = new DataTable();
SqlDataAdapter Da = new SqlDataAdapter(cmd);
Da.Fill(dt);
foreach (DataRow dr in dt.Rows)
{
textBox3.Text = dr["Description"].ToString();
textBox4.Text = dr["UM"].ToString();
textBox5.Text = dr["UP"].ToString();
}
conn.Close();
}
private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
}
}
}
EDIT:
Picture below shows my design, I want to filter what will show in Item Code combobox inside the datagridview based on the Supplier combobox
PHOTO

Newly added data from Database not showing on ComboBox

Please help when i insert a new data to the database it is not showing in the comboBox unless i restart the program. Is something missing from this ?
CmbSupp.Items.Clear();
con.Open();
Refresh();
SqlCommand cmd = con.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "select SupplierName from SuppTbl";
cmd.ExecuteNonQuery();
DataTable dt = new DataTable();
SqlDataAdapter dp = new SqlDataAdapter(cmd);
dp.Fill(dt);
foreach (DataRow dr in dt.Rows)
{
CmbSupp.Items.Add(dr["SupplierName"].ToString());
}
con.Close();
Thankyou in advance!

Change
CmbSupp.Items.Clear()
To CmbSupp.Items = null;
this is a small Bug,You have to set Null Value and Reset Data;
Try It;

You could do this:
DataTable dt = new DataTable();
private void RefreshData()
{
dt.Clear();
con.Open();
Refresh();
SqlCommand cmd = con.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "select SupplierName from SuppTbl";
cmd.ExecuteNonQuery();
SqlDataAdapter dp = new SqlDataAdapter(cmd);
dp.Fill(dt);
con.Close();
cmd.Dispose();
}
private void BindToComboBox()
{
CmbSupp.DataSource = dt;
CmbSupp.ValueMember = "SupplierName";
CmbSupp.DisplayMember = "SupplierName";
}
Ideally, you include the table's ID and put it in ValueMember property. You call the Bind ToComboBox once and just call RefreshData() when there's changes in the database. It should automatically update the contents of the combobox.

Remoting client server asp.net

I have this code in the server side.
public DataTable DIS(int IID)
{
SqlConnection con = new
SqlConnection(Properties.Settings.Default.ADP_C1ConnectionString);
con.Open();
SqlCommand cmd = con.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "Select * from Paper";
cmd.ExecuteNonQuery();
DataTable DT = new DataTable();
SqlDataAdapter DA = new SqlDataAdapter(cmd);
DA.Fill(DT);
con.Close();
return DT;
}
I want to make the grid view in the client side take its source from that function like this:
public void dis_data()
{
DataTable DT = mgr.DIS(JouranlIID);
sda.Fill(DT);
dataGridView1.DataSource = DT;
}
How to do that?

How to get data from SQL database to store in combo box - C#

How can i get the value of company_name from Comp table and store it on a comboBox?
here is my initial code on getting the values from Database and store it on a combobox:
string Sql = "select company_name from JO.dbo.Comp";
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand(Sql, conn);
cmd.CommandType = CommandType.StoredProcedure;
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
comboBox1.Items.Add(ds.Tables[0].Rows[i][0].ToString());
it point out to da.fill(ds) and says "Could not locate entry in sysdatabases for database 'select company_name from JO'. No entry found with that name. Make sure that the name is entered correctly."
hope for your reply thanks!

Use datareader it is much simpler \
string Sql = "select company_name from JO.dbo.Comp";
SqlConnection conn = new SqlConnection(connString);
conn.Open();
SqlCommand cmd = new SqlCommand(Sql, conn);
SqlDataReader DR = cmd.ExecuteReader();
while (DR.Read())
{
combobox1.Items.Add(DR[0]);
}

If you set up your connection string to be something of this sort:
string SqlConnectionString = "Data Source=[SERVER];Initial Catalog=[DATABASE];"
Then using that set up, you can set your string 'Sql' as:
string Sql = "select company_name from dbo.Comp";
This could be a possible set up you could use to read out the values.
using (SqlConnection saConn = new SqlConnection(this.ConnectionString))
{
saConn.Open();
string query = "select DBName from dbo.Company";
SqlCommand cmd = new SqlCommand(query, saConn);
using (SqlDataReader saReader = cmd.ExecuteReader())
{
while (saReader.Read())
{
string name = saReader.GetString(0);
combobox1.Add(name);
}
}
saConn.Close();
}

I would like to introduce you a very simple way to SQL data into a combobox as:
first you have a create a SQL table,
in C# platform drop a combobox and go to its property,
in the property menu click on "DataSource"
specify the database and table to load into combobox,
Note, the combobox name and table's row should be the same.

{
SqlConnection con =new SqlConnection("Data Source=Server_Name;Initial Catalog=Database_Name;integrated security=true");
SqlCommand cmd;
SqlDataReader dr;
private void CashMemoForm_Load(object sender, EventArgs e)
{
con.Open();
cmd = new SqlCommand("Select Column_Name From Table_Name", con);
dr = cmd.ExecuteReader();
while (dr.Read())
{
comboBox1.Items.Add(dr[0]).ToString();
}
}
}

Have you ever tried Entity Framework for database access and dto creation?

Change your line to cmd.CommandType = CommandType.Text; instead of cmd.CommandType = CommandType.StoredProcedure;

Try this
string Sql = "select Company_ID,company_name from JO.dbo.Comp";
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand(Sql, conn);
cmd.CommandType = CommandType.Text;
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
comboBox1.DataSource = ds.Tables[0];
comboBox1.DataTextField = "company_name";
comboBox1.DataValueField = "Company_ID";
comboBox1.DataBind();
comboBox1.Items.Insert(0, new ListItem("--Select--", "0"));
}

There is no use of for loop. you just need to check that whether the dataset contains rows or not.
string Sql = "select Company_ID,company_name from JO.dbo.Comp";
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand(Sql, conn);
cmd.CommandType = CommandType.Text;
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
if (ds.Tables[0].Rows.Count > 0)
{
comboBox1.DataSource = ds.Tables[0];
comboBox1.DataTextField = "company_name";
comboBox1.DataValueField = "Company_ID";
comboBox1.DataBind();
comboBox1.Items.Insert(0, new ListItem("Select", "0"));
}

string Sql = "select company_name from JO.dbo.Comp";
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand(Sql, conn);
cmd.CommandType = CommandType.StoredProcedure;
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
comboBox1.Items.Add(ds.Tables[0].Rows[i][0].ToString());

public System.Data.DataTable EmployeeViewAll()
{
DataTable dtbl = new DataTable();
try
{
// Here it shuld be your database Connection String
string connectionString = "Server = .; database = HKS; Integrated Security = true";
using (SqlConnection sqlCon = new System.Data.SqlClient.SqlConnection(connectionString))
{
SqlDataAdapter SqlDa = new SqlDataAdapter("employeeViewAll", sqlCon);
SqlDa.SelectCommand.CommandType = CommandType.StoredProcedure;
SqlDa.Fill(dtbl);
}
return dtbl;
}
catch (Exception)
{
throw;
}
}
public void ComboFill()
{
DataTable dt = new DataTable();
eSP SP = new eSP();
d = SP.EmployeeViewAll();
comboBox1.DataSource = dt;
comboBox1.DisplayMember = "department";
comboBox1.ValueMember = "empName";
}

Develop Reference

C# (C-Sharp) is a programming language developed by Microsoft that runs on the .NET Framework.

Fetch data from database based on checkbox on button click - c#

Related

How to retrieve data from postgres to textbox in c#.net

How to filter results in datagridview combobox based on combobox outside datagridview

Newly added data from Database not showing on ComboBox

Remoting client server asp.net

How to get data from SQL database to store in combo box - C#

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