Question

I have a Gridview in my page Which I can Select each row i want by using checkbox when i
select a row in Gridview and click on Delete button igot this error “Must declare the scalar variable “@Senduserid” “
here’s the Delete button code

protected void btnMultipleRowDelete_Click(object sender, EventArgs e)
{
    // Looping through all the rows in the  GridView

    foreach (GridViewRow row in GridView1.Rows)
    {
        CheckBox checkbox = (CheckBox)row.FindControl("chkRows");

        //Check if the checkbox is checked. 
        //value in the  CheckBox's Value property is set as the //value of the delete command's  parameter.

        while (checkbox.Checked)
        {
            // Retreive the  ID
            int ida = Convert.ToInt32(GridView1.DataKeys[row.RowIndex].Value);

            // Pass the  value of the selected Employye ID to the Delete 
            //These numbers indicate in which order tables shoulde be deleted  
            /*1*/
            new BLL.LoginBLL().Delete(ida);
            /*2*/
            new BLL.MessageBLL().Delete(ida);
            /*3*/
            new BLL.JointBLL().Delete(ida);                    
            /*4*/
            new BLL.Tempprice().Delete(ida);                    
            /*5*/
            new BLL.LotsBLL().Delete(ida);
            /*6*/
            new BLL.AuctionBLL().Delete(ida);
            /*7*/
            new BLL.ProfileBLL().DeleteProfile(ida);

            checkbox.Checked = false;
        }
        //refresh the Gridview rows
        ShowUsers();
    }
}

And code of the place I got this error:`

public bool Delete(int Id)
{
    using (SqlCommand cmd = new SqlCommand())
    {
        string text = string.Format("Delete From {0} where {1} = @{1} or {2} =@{2}"
                                        , Common.Data.MessageInfo.TableName
                                        , Common.Data.MessageInfo.SenduseridField
                                        ,Common.Data.MessageInfo.RecuseridField);
        cmd.CommandText = text;
        SqlParameter param = new SqlParameter("@" + Common.Data.MessageInfo.SenduseridField, Id);
        param.SqlDbType = SqlDbType.Int;
        param = new SqlParameter("@" + Common.Data.MessageInfo.RecuseridField, Id);
        param.SqlDbType = SqlDbType.Int;
        cmd.Parameters.Add(param);
        cmd.Connection = this.GetConnection();
        cmd.Connection.Open();
        cmd.ExecuteNonQuery();
        return true;
    }
}

DataBase Relationship

Answer 1

You instantiate two parameters, but you don’t add the first parameter to the command. Before you instantiate the recuseridfield parameter, add the senduseridfield parameter to the command’s parameter list.