public void DataSearch(string SearchKey)
        {
            string query = @"SELECT * FROM Students WHERE Name LIKE '%" + SearchKey + "%' OR Fathers_name LIKE '%" + SearchKey + "%' OR Mothers_name LIKE '%" + SearchKey + "%' OR Date_of_Admission LIKE '%" + SearchKey + "%' OR Gender LIKE '%" + SearchKey + "%' OR Class LIKE '%" + SearchKey + "%' OR Class_Roll LIKE '%" + SearchKey + "%' OR Address LIKE '%" + SearchKey + "%'";

            GridViewAddStudents.DataSource = dm.GetDataTable(query);
            GridViewAddStudents.DataBind();
            if (dm.count == 0)
            {
                lblSearchResult.Text = "Sorry! no data found";
            }
            else
            {
                lblSearchResult.Text = "";
            }
        }
        public void LoadGridAddStudents()
        {
            string query = @"SELECT [ID]
                                   ,[Name]
                                   ,[Fathers_name]
                                   ,[Mothers_name]
                                   ,[Date_of_Birth]
                                   ,[Date_of_Admission]
                                   ,[Gender]
                                   ,[Class]
                                   ,[Class_Roll]
                                   ,[Phone]
                                   ,[Email]
                                   ,[Address]
                               FROM [dbo].[Students]";

            GridViewAddStudents.DataSource = dm.GetDataTable(query);
            GridViewAddStudents.DataBind();
        }