GridView和SqlDataSource

Question

Im trying to create my own command to extract data. First im make in .aspx from toolbox SqlDataSource :

 <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        onselecting="SqlDataSource2_Selecting"></asp:SqlDataSource>

Then add GridView:

 <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        onselecting="SqlDataSource1_Selecting"></asp:SqlDataSource>

and now I want to write my own query so I doubleclick on "SqlDataSource" >go into .aspx.cs:

protected void SqlDataSource1_Selecting(object sender, SqlDataSourceSelectingEventArgs e)    
{
    SqlDataSource1.SelectCommand = "SELECT name, num  FROM Table WHERE T_Name=@MyString";
}

Where is the problem ? When I run this app is not working.

Answer 1

you didn't set the parameters for SqlDataSource1 .
and i cant the connection string.

Answer 2

There are a few problems. First one is you have used a parameterized query but haven't define what your parameter is. Second one is you just assign an SQL query to your SqlDataSource1 but you haven't say that to do with that.

protected void Page_Load(object sender, EventArgs e)
{
    System.Data.Sql.SqlConnection conn= new System.Data.Sql.SqlConnection(/*your connection string comes here*/);

    string query= "SELECT name, num  FROM Table WHERE T_Name=@MyString";

    System.Data.DataTable dt = new System.Data.DataTable();
    System.Data.Sql.SqlCommand cmd = new System.Data.Sql.SqlCommand(query, conn);

    System.Data.Sql.SqlDataAdapter da1 = new System.Data.Sql.SqlDataAdapter(cmd );
    da1.SelectCommand.Parameters.AddWithValue("@MyString", your_string);

    da1.Fill(dt);

        if (dt.Rows.Count > 0)
        {
            GridView1.DataSource = dt;
            GridView1.DataBind();
        }
    }

Answer 3

You should add select parameters with the select command

protected void SqlDataSource1_Selecting(object sender, SqlDataSourceSelectingEventArgs e)
        {
            SqlDataSource1.SelectCommand = "SELECT name, num  FROM Table WHERE T_Name=@MyString";
SelectParameters["MyString"].DefaultValue = "Your Parameter here";

        }