I have a dropdownlist that is populated with semesters. When the semester selection is changed, I want to populate another dropdownlist with courses available for that semester based on the semesterID. I have a stored procedure in SQL Server that gets courses based on the semesterId parameter. The semester list is populated just fine, but when I select a semester, I get an error while using the SP to get the courses. The error says Procedure or function 'GetCourses' expects parameter '#semesterId', which was not supplied. even though I supply the value for #semesterId before I open the connection. What am I doing wrong?
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
PopulateSemesterList();
}
private void PopulateSemesterList()
{
string connstring;
connstring = ConfigurationManager.ConnectionStrings["dbConn"].ConnectionString;
SqlConnection conn = new SqlConnection(connstring);
SqlCommand cmd = new SqlCommand("dbo.GetSemesters", conn);
conn.Open();
DDSemesters.DataSource = cmd.ExecuteReader();
DDSemesters.DataTextField = "semesterName";
DDSemesters.DataValueField = "semesterId";
this.DataBind();
conn.Close();
conn.Dispose();
DDSemesters.Items.Insert(0, new ListItem("Select Semester", "0"));
DDSemesters.SelectedIndex = 0;
}
protected void DDSemesters_SelectedIndexChanged(object sender, EventArgs e)
{
DropDownList DDSemesters = sender as DropDownList;
int selectedSemester = Convert.ToInt32(DDSemesters.SelectedItem.Value);
string connstring;
connstring = ConfigurationManager.ConnectionStrings["dbConn"].ConnectionString;
SqlConnection conn = new SqlConnection(connstring);
SqlCommand cmd = new SqlCommand("dbo.GetCourses", conn);
cmd.Parameters.Add(new SqlParameter("#semesterId", selectedSemester));
conn.Open();
DDCourses.DataSource = cmd.ExecuteReader();
DDCourses.DataTextField = "courseName";
DDCourses.DataValueField = "courseId";
this.DataBind();
conn.Close();
conn.Dispose();
DDCourses.Items.Insert(0, new ListItem("Select Course", "0"));
DDCourses.SelectedIndex = 0;
DDCourses.Visible = true;
CoursesLbl.Visible = true;
}
As far as I can tell your CommandType is the default, Text, which causes the CommandText to be interpreted as an SQL query instead of just a stored procedure name.
You'll want to set it to StoredProcedure instead:
cmd.CommandType = CommandType.StoredProcedure;
Alternatively you could make your command a full SQL query that properly passes the parameters to the stored procedure.
Related
I have a DropDownList that gets populated by a SQL Server table called tblVisa. My issue is that the values that are being populated from the SQL Server table are not being saved. Everything else gets saved except for my DropDownLists. I've tried using .SelectedValue and .Text, but it still does not work.
Here is my code
protected void PopulateVisaType()
{
List<ListItem> result = new List<ListItem> { new ListItem("", "") };
SqlCommand cmd = new SqlCommand() { Connection = sqlConn, CommandText = "SELECT VisaType FROM tblVisa ORDER BY VisaType ASC" };
if (sqlConn.State == ConnectionState.Closed)
{
sqlConn.Open();
}
SqlDataReader read = cmd.ExecuteReader();
while (read.Read())
{
result.Add(new ListItem(read["VisaType"].ToString(), read["VisaType"].ToString()));
}
read.Close();
sqlConn.Close();
cmd.Dispose();
DDLVisa.DataSource = result;
DDLVisa.DataValueField = "value";
DDLVisa.DataTextField = "text";
DDLVisa.DataBind();
}
Here's my code for saving the information into the database:
protected void LbSaveProfile_Click(object sender, EventArgs e)
{
SqlCommand cmd = new SqlCommand() { Connection = sqlConn, CommandText = "spSaveNewProviderInformation", CommandType = CommandType.StoredProcedure };
if (sqlConn.State == ConnectionState.Closed)
{
sqlConn.Open();
}
cmd.Parameters.AddWithValue("#EmployeeNumber", TbEmployeeNumber.Text.Trim());
cmd.Parameters.AddWithValue("#SSN", TbSSN.Text.Trim());
cmd.Parameters.AddWithValue("#ContractType", DDLContractType.SelectedItem.Value);
cmd.Parameters.AddWithValue("#Firstname", TbFirstname.Text.Trim());
cmd.Parameters.AddWithValue("#Lastname", TbLastname.Text.Trim());
cmd.Parameters.AddWithValue("#MiddleInitial", TbMiddleInitial.Text.Trim());
cmd.Parameters.AddWithValue("#ContractRenewalDate", TbContractRenewalDate.Text.Trim());
cmd.Parameters.AddWithValue("#Position", DDLPosition.Text.Trim());
cmd.Parameters.AddWithValue("#Specialty", DDLSpecialty.Text.Trim());
cmd.Parameters.AddWithValue("#PrimaryDepartment", DDLPrimaryDepartment.Text.Trim());
cmd.Parameters.AddWithValue("#SecondaryDepartment", DDLSecondaryDepartment.Text.Trim());
cmd.Parameters.AddWithValue("#Gender", DDLGender.Text.Trim());
cmd.Parameters.AddWithValue("#Birthdate", TbBirthdate.Text.Trim());
cmd.Parameters.AddWithValue("#EmailAddress", TbEmailAddress.Text.Trim());
cmd.Parameters.AddWithValue("#PhoneNumber", TbPhoneNumber.Text.Trim());
cmd.Parameters.AddWithValue("#Address", TbAddress.Text.Trim());
cmd.Parameters.AddWithValue("#PassportNumber", TbPassportNumber.Text.Trim());
cmd.Parameters.AddWithValue("#Citizenship", DDLCitizenship.Text.Trim());
cmd.Parameters.AddWithValue("#Visa", DDLVisa.Text.Trim());
cmd.Parameters.AddWithValue("#Status", 1);
cmd.ExecuteNonQuery();
sqlConn.Close();
Alert("Provider Information saved!");
ClearControls();
}
You much better to provide the drop down list with column names.
So, say this:
protected void PopulateVisaType()
{
SqlConnection sqlConn = new SqlConnection("");
using (SqlCommand cmd = new SqlCommand("SELECT VisaType FROM tblVisa ORDER BY VisaType ASC", sqlConn))
{
if (sqlConn.State == ConnectionState.Closed)
{
sqlConn.Open();
}
DDLVisa.DataSource = cmd.ExecuteReader();
DDLVisa.DataValueField = "VisaType";
DDLVisa.DataTextField = "VisaType";
DDLVisa.DataBind();
//DDLVisa.Items.Insert(0, new ListItem("")); // optional blank row choice
sqlConn.Close();
}
}
So the TextField, and the DataText field need to be a named column from the data source.
I also included an optional first blank option if you need/want/expect to have no choice.
However, keep in mind that this empty string should be translated into a null in your database if you don't allow (or want) empty strings, and want a null for that value. This applies to all of your values. (perhaps the stored procedure does this?).
I am making a basic web form with basic fields like name, email, number.
I just want, when i enter the number, rest of the fields are populated in the other textboxes based on that number from sql server.
Any help would be appreciated.
Code is as follows :
string ConnectionString = ConfigurationManager.ConnectionStrings["DbConnection"].ConnectionString;
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnSave_Click(object sender, EventArgs e)
{
string cmd = "IF NOT EXISTS(Select * from tbl_registration where Email = #Email OR MobileNo = #MobileNo) insert into tbl_registration values(#FirstName, #LastName,#Email,#MobileNo,#Address_1,#Address_2,#City,#State)";
using (SqlConnection con = new SqlConnection(ConnectionString))
{
using(SqlCommand com = new SqlCommand(cmd, con))
{
com.Parameters.AddWithValue("#FirstName", txtfname.Text.Trim());
com.Parameters.AddWithValue("#LastName", txtlname.Text);
com.Parameters.AddWithValue("#Email", txtemail.Text);
com.Parameters.AddWithValue("#MobileNo", txtmob_no.Text);
com.Parameters.AddWithValue("#Address_1", txtaddress1.Text);
com.Parameters.AddWithValue("#Address_2", txtaddress2.Text);
com.Parameters.AddWithValue("#City", txtcity.Text);
com.Parameters.AddWithValue("#State", txtstate.Text);
con.Open();
int success = com.ExecuteNonQuery();
if (success > 0)
{
Response.Write("<script>alert('Registration successfull')</script>");
}
else
{
Response.Write("<script>alert('Registration Not Sucessfull')</script>");
}
}
}
}
You should write the method definition as shown below on the text box changed event.
This is not the complete query answer. Here is a reference for you.
using (SqlConnection conn = new SqlConnection(CSs))
{
string query = "Your SQL Query here";
SqlCommand cmd = new SqlCommand(query, conn);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds, "sometablename");
firstnametext.Text = Convert.ToString(ds.Tables["sometablename"].Rows[0]["Firstname"]);
}
Here you need to properly handle the null for the data table.
I am using SQL Server 2014 and Visual Studio 2013. I want to write C# code so that user should check checkbox and select an item from combobox then this item will be sent to a stored procedure in SQL Server. In real I want to send parameter to stored procedure from combobox. Code below written by me but does not work well.
private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
if (checkBox1.Checked) ;
SqlConnection con = new SqlConnection(#"Data Source=USER-PC\----);
SqlCommand Cmd = new SqlCommand("select_Info_Person", con);
Cmd.CommandType = CommandType.StoredProcedure;
con.Open();
DataTable dt = new DataTable();
using(SqlDataAdapter da = new SqlDataAdapter(Cmd))
{
da.Fill(dt);
comboBox1.DisplayMember = "Person_Expert";
comboBox1.DataSource = dt;
con.Close();
}
}
No problem, if SP is without any parameter. It seems your connection string is not properly initialized, otherwise no problem at all. Check the Error type and share. Otherwise OK.
It seems that you are not sending any parameter to the Stored procedure
Step 1:
Declare Parameter in your storedprocedure and use it in where condition..
CREATE PROCEDURE select_Info_Person
-- Add the parameters for the stored procedure here
#p1 int = 0
AS
BEGIN
-
-- Insert statements for procedure here
Select * from PersonMaster where personID=#p1
END
GO
Then in the code
private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
if (CheckBox.Checked) ;
SqlConnection con = new SqlConnection(#"Data Source=USER-PC\----");
SqlCommand Cmd = new SqlCommand("select_Info_Person", con);
Cmd.CommandType = CommandType.StoredProcedure;
Cmd.Parameters.AddWithValue("#p1", comboBox1.SelectedValue.ToString());
// or if you dont have value feild
// Cmd.Parameters.AddWithValue("#p1", comboBox1.Selecteditem.Text.ToString());
con.Open();
DataTable dt = new DataTable();
using (SqlDataAdapter da = new SqlDataAdapter(Cmd))
{
da.Fill(dt);
//I cannot understand what you are doing using below
// comboBox1.DisplayMember = "Person_Expert";
// comboBox1.DataSource = dt;
// con.Close();
}
}
protected void CompanyDropDown_Click(object sender, EventArgs e)
{
string connectionString = ConfigurationManager.ConnectionStrings["DBConnection"].ConnectionString;
using (SqlConnection cn = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand("[dropdownCompany]", cn);
cn.Open();
CompanyDropDown.DataSource = cmd.ExecuteReader();
CompanyDropDown.DataBind();
}
}
The stored procedure dropdownCompany is just one column with a list of company names.
For some reason this is not populating the drop down when I execute the web form.
Before binding, specify DataTextField and DataValueField for the dropdown.
DataTextField and DataValueField should be the name of columns from the result set which you get after executing your stored procedure.
You should specify which field will be visible to the user in the dropdown. This will be your DataTextField.
DataValueField is not visible to the user. but you will need this value when you are performing some other operation based on the selected item in the dropdown.
CompanyDropDown.DataTextField = "Name";
CompanyDropDown.DataValueField = "ID";
CompanyDropDown.DataBind();
You will have to set the CommandType property of your SqlCommand object to CommandType.StoredProcedure
protected void CompanyDropDown_Click(object sender, EventArgs e)
{
string connectionString = ConfigurationManager.ConnectionStrings["DBConnection"].ConnectionString;
using (SqlConnection cn = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand("[dropdownCompany]", cn);
cmd.CommandType = CommandType.StoredProcedure;
cn.Open();
CompanyDropDown.DataSource = cmd.ExecuteReader();
CompanyDropDown.DataBind();
}
}
I have two tables in a SQL Server database. I select from table ADMS and I need to insert master table by gridview but I dont know how to insert with gridview. Please help. I've tried for many days and I did not pass yet
protected void Button3_Click1(object sender, EventArgs e)
{
if (RadioButton2.Checked)
{
SqlConnection con = new SqlConnection(MyConnectionString);
// con.Open(); // don't need the Open, the Fill will open and close the connection automatically
SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM ADMS_Machining where datetime='" + TextBox1.Text + "'", con);
mytable = new DataTable();
da.Fill(mytable);
GridView2.DataSource = mytable;
GridView2.DataBind();
}
else
{
SqlConnection con = new SqlConnection(MyConnectionString);
// con.Open(); // don't need the Open, the Fill will open and close the connection automatically
SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM Machining_Master where datetime='" + TextBox1.Text + "'", con);
mytable = new DataTable();
da.Fill(mytable);
GridView2.DataSource = mytable;
GridView2.DataBind();
}
}
protected void Button4_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection();
SqlCommand cmd = new SqlCommand();
String strConnString, strSQL;
strConnString = "Server=kane-pc;UID=sa;PASSWORD=1234;Database=Machining;Max Pool Size=400;Connect Timeout=600;";
//here
conn.ConnectionString = conn;
conn.Open();
cmd.Connection = conn;
cmd.CommandText = strSQL;
}
You can extract values from a grid view depending on what you have placed in the cells...
string value = this.GridView2.Rows[0].Cells[0].Text;
You can also track the selected row event, and get specific controls like the following...
protected void OnSelectedIndexChanged(object sender, EventArgs e)
{
string someValueTakenFromLabel = (GridView2.SelectedRow.FindControl("lblAnyLabelHere") as Label).Text;
// .... do something with value here
}
I suggest you go through some tutorials though to get the hang of how to use GridView.
http://www.asp.net/web-forms/videos/building-20-applications/lesson-8-working-with-the-gridview-and-formview
http://www.aspsnippets.com/Articles/How-to-get-Selected-Row-cell-value-from-GridView-in-ASPNet.aspx
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.gridview%28v=vs.110%29.aspx
You have to first read data from cells and then insert them into database using SqlCommand.
Assuming that you have M_ID and M_NAME columns in your Machining_Master table you can insert values to database as below:
//Assuming that your id column is first column and name is second column
//get value of id and name
int mId = Convert.ToInt32(GridView2.SelectedRow.Cells[0].Text);
string mName = GridView2.SelectedRow.Cells[1].Text;
string connectionStrng = "your connection string";
string insertSql = "INSERT INTO Machining_Master (M_ID, M_NAME) VALUES (#mId, #mName)";
using (SqlConnection conn = new SqlConnection(connectionStrng))
{
using (SqlCommand cmd = new SqlCommand(insertSql, conn))
{
try
{
cmd.Parameters.Add(new SqlParameter("mId", mId));
cmd.Parameters.Add(new SqlParameter("mName", mName));
conn.Open();
cmd.ExecuteNonQuery();
}
finally
{
//Close connection
conn.Close();
}
}
}