Asp.net dropdownlist control not bind in gridview

Question

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SQL

create proc getQuantityUpTo100
as
begin
  DECLARE @intFlag INT
  SET @intFlag = 0
  WHILE (@intFlag <=100)
  BEGIN
    PRINT @intFlag
    SET @intFlag = @intFlag + 1
  END
end

c# code

C#

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        var ddl = (DropDownList)e.Row.FindControl("myDropDownList");
        SqlConnection con = new SqlConnection(StrConnection);
        con.Open();
        DataTable dt = new DataTable();
        SqlCommand cmd = new SqlCommand("getQuantityUpTo100", con);
        cmd.CommandType = CommandType.StoredProcedure;

        SqlDataAdapter da = new SqlDataAdapter(cmd);
        da.Fill(dt);

        ddl.DataSource = dt;
        ddl.DataBind();
    }
}

asp.net code

HTML

<asp:TemplateField HeaderText="Quantity">
  <ItemTemplate>
    <asp:DropDownList ID="myDropDownList"  Style="width: 350px;" runat="server" OnSelectedIndexChanged="myDropDownList_SelectedIndexChanged"
                                                    AutoPostBack="true" EnableViewState="true">

    </asp:DropDownList>

Posted 11-Dec-14 2:37am

Rajnish D mishra

Updated 11-Dec-14 2:59am

Tomas Takac

v2

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Comments

Tomas Takac 11-Dec-14 8:59am

What exactly is the problem?

Praveen Kumar Upadhyay 11-Dec-14 9:07am

Are you getting any error??

1 solution

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Richard Deeming · Accepted Answer · 2014-12-11T03:10:00

Values passed to PRINT in your stored procedure will not be part of any result-set. Only values returned as part of a SELECT statement will appear in your DataTable.

You could fix the stored procedure:

SQL

CREATE PROC getQuantityUpTo100
As
BEGIN
    SELECT TOP 101
        ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) - 1 As N
    FROM
        sys.all_columns
    ;
END

However, since you're just returning a list of numbers from 0 to 100, you don't need a stored procedure. Make sure you have a reference to the System.Core assembly, and a using System.Linq; statement at the top of your code file, and then use:

C#

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        var ddl = (DropDownList)e.Row.FindControl("myDropDownList");
        ddl.DataSource = Enumerable.Range(0, 101);
        ddl.DataBind();
    }
}

Since the list is static, and trivial to recreate on post-back, you could reduce the size of your ViewState by binding the list in the control's Init event, rather than the GridView's RowDataBound event:

ASP.NET

<asp:DropDownList ID="myDropDownList"  runat="server"
    AutoPostBack="true"
    Style="width: 350px;"
    OnInit="BindMyDropDownList"
    OnSelectedIndexChanged="myDropDownList_SelectedIndexChanged"
/>

C#

protected void BindMyDropDownList(object sender, EventArgs e)
{
    var ddl = (DropDownList)sender;
    ddl.DataSource = Enumerable.Range(0, 101);
    ddl.DataBind();
}