I want to debug my c# code in vs code but when I run I encountered some errors .and it needs some references.so I add system.data.sqlclient but again it needs reference for SqlDataAdapter .please help me to solve this problem
using System;
using System.Data;
using System.Data.SqlClient;
namespace ConsoleApplication
{
public class Program
{
public static void Main(string[] args)
{
try
{ DataTable dt = new DataTable();
SqlConnection sqlconn = new SqlConnection(DBsetting.Connstring);
SqlDataAdapter sqlda = new SqlDataAdapter("SelectUserswith", sqlconn);
sqlda.SelectCommand.CommandType = CommandType.StoredProcedure;
sqlda.SelectCommand.Parameters.AddWithValue("#n", textBox1.Text.Trim());
dt.Clear();
sqlda.Fill(dt);
if (dt.Rows!=null && dt.Rows.Count > 0 && dt.Rows[0]["username"] != null && dt.Rows[0]["Depassword"].ToString() == textBox2.Text.Trim())
{
this.Hide();
MenuFrm f1 = new MenuFrm();
f1.un = dt.Rows[0]["name"].ToString();
f1.uID = dt.Rows[0]["ID"].ToString();
f1.username = dt.Rows[0]["username"].ToString();
f1.Show();
}
else
{
MessageBox.Show("Error");
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
}
Error :
file: 'file:///c%3A/Users/JAVAD/Documents/SampleVsCode/Program.cs'
severity: 'Error'
message: 'The type or namespace name 'SqlDataAdapter' could not be found (are you missing a using directive or an assembly reference?)'
at: '13,17'
source: ''
file: 'file:///c%3A/Users/JAVAD/Documents/SampleVsCode/Program.cs'
severity: 'Error'
message: ''DataTable' does not contain a definition for 'Clear' and no extension method 'Clear' accepting a first argument of type 'DataTable' could be found (are you missing a using directive or an assembly reference?)'
at: '16,20'
source: ''
Software :
The using clause makes a reference to the namespace of the classes you are using. You also need to add a reference to the dll that the namespace is defined in.
in solution explorer there is a node under your project called Reference . Right click this ans choose Add from the menu. Find System.Data and include that.
If you refer to the MSDN documentation at https://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqldataadapter(v=vs.110).aspx
It tells you the namespace and dll you need.
Namespace: System.Data.SqlClient
Assembly: System.Data (in System.Data.dll)
Related
I have installed Microsoft.azure.data nuget package in visual studio but I m getting below error-
Program.cs(1,17): error CS0234: The type or namespace name 'Azure' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?) below is my program code -
using Microsoft.Azure.Kusto.Data;
using System;
namespace LensDashboradOptimization
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Hello World!");
//var clusterUrl = "https://mykusto.kusto.windows.net";
// replace 'WithAadUserPromptAuthentication' with your preferred method of authentication
//var kcsb = new Kusto.Data.KustoConnectionStringBuilder(clusterUrl);
//Console.WriteLine(kcsb);
// Read the first row from reader -- it's 0'th column is the count of records in MyTable
// Don't forget to dispose of reader when done.
var client = Kusto.Data.Net.Client.KustoClientFactory.CreateCslQueryProvider("https://help.kusto.windows.net/Samples;Fed=true");
var reader = client.ExecuteQuery("StormEvents | count");
Console.WriteLine(reader);
}
}
}
Install Microsoft.Azure.Kusto.Data nuget. then it compiles for me. It does give me authentication errors but not assembly reference errors.
using Kusto.Data.Net.Client;
namespace ConsoleApp2
{
class Program
{
static void Main(string[] args)
{
var client = KustoClientFactory.CreateCslQueryProvider("https://help.kusto.windows.net/Samples");
var reader = client.ExecuteQuery("StormEvents | count");
}
}
}
Okay, this may seem silly. But, I don't know how to do an "import" in C#, in visual studio 2008. I know java, but not C#. Currently, I don't have the time to read a c# book. So, I need some help to get it right.
I was trying to use the code here - SSIS Getting Execute Sql Task result set object
DataTable dt = new DataTable();
OleDbDataAdapter oleDa = new OleDbDataAdapter();
oleDa.Fill(dt, Dts.Variables["User::objShipment"].Value);
And I get the error - The type or namespace name 'OledDbDataAdapter' could not be found (are you missing a using directive or an assembly reference?)
I tried to do a java style import. But it failed.
using System.Data.OleDb::OleDbDataAdapter
Full code given below -
using System;
using System.Data;
using Microsoft.SqlServer.Dts.Runtime;
using System.Windows.Forms;
using System.Data.OleDb;
namespace ST_LongCodeGoesHere.csproj
{
[System.AddIn.AddIn("ScriptMain", Version = "1.0", Publisher = "", Description = "")]
public partial class ScriptMain : Microsoft.SqlServer.Dts.Tasks.ScriptTask.VSTARTScriptObjectModelBase
{
#region VSTA generated code
enum ScriptResults
{
Success = Microsoft.SqlServer.Dts.Runtime.DTSExecResult.Success,
Failure = Microsoft.SqlServer.Dts.Runtime.DTSExecResult.Failure
};
#endregion
//To see the comment here, look at beyond end of this code.
public void Main()
{
// TODO: Add your code here
DataTable table = new DataTable();
OledDbDataAdapter oleDbA = new OleDbDataAdapter();
Dts.TaskResult = (int)ScriptResults.Success;
}
}
}
The comment was -
/*
The execution engine calls this method when the task executes.
To access the object model, use the Dts property. Connections, variables, events,
and logging features are available as members of the Dts property as shown in the following examples.
To reference a variable, call Dts.Variables["MyCaseSensitiveVariableName"].Value;
To post a log entry, call Dts.Log("This is my log text", 999, null);
To fire an event, call Dts.Events.FireInformation(99, "test", "hit the help message", "", 0, true);
To use the connections collection use something like the following:
ConnectionManager cm = Dts.Connections.Add("OLEDB");
cm.ConnectionString = "Data Source=localhost;Initial Catalog=AdventureWorks;Provider=SQLNCLI10;Integrated Security=SSPI;Auto Translate=False;";
Before returning from this method, set the value of Dts.TaskResult to indicate success or failure.
To open Help, press F1.
*/
In C#, you don't import individual types, you import whole namespaces. Something like this
should work:
using System.Data.OleDb;
...
OleDbDataAdapter oleDa = new OleDbDataAdapter();
Or you could create a type alias like this:
using OleDbDataAdapter = System.Data.OleDb.OleDbDataAdapter;
Further Reading
using Directive (C# Reference)
In Solution Explorer under your Solution find 'References' and add System.Data by right-clicking and 'Add reference'. You probably also want to type your import as: using System.Data.OleDb;
Have a look at this http://msdn.microsoft.com/en-us/library/vstudio/wkze6zky.aspx
You need to add the reference, before you can use it.
I have downloaded the Roslyn CTP and have run across the following error.A CompilationErrorException is thrown when executing the line session.Execute(#"using System.Linq;"); with the following message:
(1,14): error CS0234: The type or namespace name 'Linq' does not exist in the namespace 'System' (are you missing an assembly reference?)
My code is:
namespace RoslynError
{
using System;
using Roslyn.Scripting;
using Roslyn.Scripting.CSharp;
internal class RoslynError
{
static void Main(string[] args)
{
var engine = new ScriptEngine();
Session session = engine.CreateSession();
session.Execute(#"using System.Collections;");
session.Execute(#"using System.Linq;");
Console.ReadKey();
}
}
}
I'm especially confused as to why the System.Linq line throws an error while System.Collections is fine.
The engine needs a reference to the assembly that the System.Linq namespace is in (System.Core.dll)
engine.AddReference(typeof(System.Linq.Enumerable).Assembly.Location);
This needs to be done before the session is created.
I have using System.Management;
However, I keep getting this error:
The type or namespace name 'ManagementClass' does not exist in the namespace 'System.Management' (are you missing an assembly reference?)
I get that error twice.
I also get this error:
The type or namespace name 'ManagementObjectCollection' does not exist in the namespace 'System.Management' (are you missing an assembly reference?)
Why does this happen?
If it helps, this is my code (completely taken from StackOverflow, but still the code I'm using)
private string identifier(string wmiClass, string wmiProperty)
//Return a hardware identifier
{
string result = "";
System.Management.ManagementClass mc = new System.Management.ManagementClass(wmiClass);
System.Management.ManagementObjectCollection moc = mc.GetInstances();
foreach (System.Management.ManagementObject mo in moc)
{
//Only get the first one
if (result == "")
{
try
{
result = mo[wmiProperty].ToString();
break;
}
catch
{
}
}
}
return result;
}
private void getButton_Click(object sender, EventArgs e)
{
string modelNo = identifier("Win32_DiskDrive", "Model");
string manufatureID = identifier("Win32_DiskDrive", "Manufacturer");
string signature = identifier("Win32_DiskDrive", "Signature");
string totalHeads = identifier("Win32_DiskDrive", "TotalHeads");
}
The problem is that the DLL is not referenced under Solution/{PROJECT}/References. Right click on References and choose "Add Assembly" (or whatever) and go to the .NET tab and find System.Management.
Just because the using statement is there does not mean the DLL is referenced.
A nice guide is over on MSDN.
my question is that if the user click on button(which is placed in default.aspx,for example) then the database table is created in database(database is placed in sql express 2005)how can do ?.
I try this task by another method but the following errors are occurred:
1.'system.Web.UI.Page.Server' is a 'property' but is used like a 'type'.
2.The type or namespace name 'Database' could not be found(are you
missing a using directive or an
assembly reference?)
3.The name 'DataType' does not exist in the current context.
4.'System.Web.UI.WebControls.Table' does not contain a definition for
'columns' and no extension method
'columns' accepting a first argument
of type
'System.Web.UI.WebControls.Table' could be found(are you missing a using
directive or an assembly reference.
5.'System.Data.Index' is inaccessible due to its protection
level.
6.'System.Data.Index' does not contain a constructor that takes '2'
arguments.
7.'System.Data.Index' does not contain a definition for
'IndexKeyType' and no extension method
'IndexKeyType' accepting a first
argument of type 'System.Data.Index'
could be found(are you missing a using
directive or an assembly reference?)
8.The name 'IndexKeyType' does not exist in the current context.
9.'System.Data.Index' does not contain a definition
for'IndexedColumns' and no extension
method 'IndexedColumns' accepting a
first argument of type
'System.Data.Index' could be found(are
you missing a using directive or
assembly reference?)
10.The type or namespace name 'Indexedcolumn' could not be found(are
you missing a using directive or an
assembly reference?)
11.'System.Web.UI.WebControls.Table' does not contain a definition for
'Indexes' and no extension method
'Indexes' accepting a first argument
of type
'System.Web.UI.Webcontrols.Table'
could be found(are you missing a using
directive or an assembly reference?)
13.'System.Web.UI.WebControls.Table' does not Contain a definition for
'Create' and no extension method
'Create' accepting a first argument of
type 'Systen.Web.UI.WebControls.Table'
could be found(are you missing a using
directive or an assembly reference?)
The code written in c# behind the button is that:
using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Collections.Generic;
//using System.Data.OleDb;
using System.Diagnostics;
using System.ComponentModel;
using System.Text;
using System.Data.SqlClient;
//using System.Data.Odbc;
using Microsoft.SqlServer.Management.Common;
//using ADOX;
//using ADODB;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
// Establish the database server
string connectionString = ConfigurationManager.ConnectionStrings["gameConnectionString"].ConnectionString;
SqlConnection connection =
new SqlConnection(connectionString);
Server server =
new Server(new ServerConnection(connection));
// Create table in my personal database
Database db = server.Databases["game"];
// Create new table, called TestTable
Table newTable = new Table(db, "TestTable");
// Add "ID" Column, which will be PK
Column idColumn = new Column(newTable, "ID");
idColumn.DataType = DataType.Int;
idColumn.Nullable = false;
idColumn.Identity = true;
idColumn.IdentitySeed = 1;
idColumn.IdentityIncrement = 1;
// Add "Title" Column
Column titleColumn = new Column(newTable, "Title");
titleColumn.DataType = DataType.VarChar(50);
titleColumn.Nullable = false;
// Add Columns to Table Object
newTable.Columns.Add(idColumn);
newTable.Columns.Add(titleColumn);
// Create a PK Index for the table
Index index = new Index(newTable, "PK_TestTable");
index.IndexKeyType = IndexKeyType.DriPrimaryKey;
// The PK index will consist of 1 column, "ID"
index.IndexedColumns.Add(new IndexedColumn(index, "ID"));
// Add the new index to the table.
newTable.Indexes.Add(index);
// Physically create the table in the database
newTable.Create();
}
}
sir please solve these errors and also give the solution in detail through which i can easily understand.I am very confused in this task please help me.Thank sir
Suggest abandoning your current approach. The problems go beyond namespacing. Suggest taking these steps:
create a brand new test project for the following
determine the SQL statements for
creating a table with all columns
creating the index
execute the SQL statements above using ADO.NET. Suggest a SqlConnection and SqlCommand.
Something like this:
using (var conn = new SqlConnection(connString))
{
using (var cmd = conn.CreateCommand())
{
cmd.CommandText = createTableStatement; //CREATE TABLE Foo (ID int);
conn.Open();
cmd.ExecuteNonQuery();
cmd.CommandText = createIndexStatement;
cmd.ExecuteNonQuery();
}
}
This will get you started on accomplishing your task. Be sure that any user-entered data aren't simply placed into your strings to create your objects. If so, change the approach to use parameters with your SqlCommand.
Here's an article on Beginner's Guide to Accessing SQL Server Through C#