Question

I’m geting the following error message for given code when user clicks on search button more than two times. Could some one please help what i’m doing wrong.

The variable name ‘@Param’ has already
been declared. Variable names must be
unique within a query batch or stored
procedure.

protected void btnSearch_Click(object sender, EventArgs e)
{
    DS.SelectCommand = 
      "SELECT ReportName, ReportType, 
       FROM Table 
       WHERE ReportName LIKE @param 
       ORDER BY ReportType Desc";
   DS.SelectParameters.Add("Param", searchTxtBox.Text.Replace("'", "''"));
   DS.DataBind();
   ListView1.DataBind();               
}

Answer 1

TRy

DS.SelectCommand = 
    "SELECT ReportName, ReportType, 
     FROM Table 
     WHERE ReportName LIKE @param 
     ORDER BY ReportType Desc";
DS.SelectParameters.Clear();
DS.SelectParameters.Add("Param", searchTxtBox.Text.Replace("'", "''"));