Click button outside grid view and display the grid view upon load?

Question

Hi, I am doing a online web application whereby user is able to enter in new template as well as search for template. The Add template is located outside the grid view and if user clicks on the button, it will load the grid view that is populated with data as there is a row of empty fields at the bottom. However when I click on the Add Template button, the grid view does not appear.
This is my business logic that I used it to search for records as well to click on the Add Template button to add in new records:

 

using System;

using System.Collections.Generic;

using System.Data;

using System.Data.SqlTypes;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using com.vrm.database;

using com.vrm.com;

namespace StarTrack

{

public partial class 
ContractTemplate : System.Web.UI.Page

{

private vrm_database vrmdb 
= new vrm_database();

private String 
viewStateGVName = "gvTemplate";





//set the index 
for the columns of the gridview in the aspx that required formatting of 
text

private const int 
GVCHKBOX = 0;

private const int 
GVEDITBTN = 1;

private const int 
GVVENDORBRN = 2;

private const int 
GVMATERIALGRP = 4;

private const int 
GVINSAP = 8;

private const int 
GVSTARHUBCONTACTPERSON = 9;

private const int 
GVDELETEFLAG = 16;

private const int 
GVBLOCKED = 17;

//set the const 
for the ID of the GV Checkbox column

private const string GVCHECKBOXCOLID = "selected";



protected void 
Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

//Set the 
sortExpression

ViewState[this.ToString() + "_SortExpression"] 
= "TemplateName";

ViewState[this.ToString() + "_SortDirection"] = 
"ASC";







}

}

protected void 
btnClear_Click(object sender, EventArgs e)

{

gvTemplate.Visible = false;

tbSearchTID.Text = "";

tbSearchTName.Text = "";



}

protected void 
btnSearch_Click(object sender, EventArgs e)

{

BindGrid(true);

gvTemplate.Visible = true;

}

protected void 
chkSelectAll_CheckedChanged(object sender, EventArgs e)

{

CheckBox chk;

foreach (GridViewRow rowItem 
in gvTemplate.Rows)

{

chk = (CheckBox)(rowItem.Cells[0].FindControl("selected"));

chk.Checked = ((CheckBox)sender).Checked;

}

}

private void 
lblerror(string p)

{

throw new NotImplementedException();

}

//Bind the 
GridView to with the Database returned records

private void 
BindGrid(bool Reload)

{



DataTable dtTemplateRecords = null;



if (Reload)

//get from 
database and bind to GV

{

dtTemplateRecords = vrmdb.Get_TemplateRecords(tbSearchTID.Text, 
tbSearchTName.Text).Tables[0];

ViewState[viewStateGVName] = dtTemplateRecords;

}

else

{ //vrmdb.Get_TemplateRecords(tbSearchTName.Text)

//retrive the 
view state object data table from previous retrival

dtTemplateRecords = ViewState[viewStateGVName] as DataTable;

}

if (dtTemplateRecords != null)

{

gvTemplate.Columns[GVCHKBOX].Visible = true;

gvTemplate.DataSource = ViewState[viewStateGVName];

gvTemplate.AllowSorting = true;

gvTemplate.DataBind();

}

else

{

dtTemplateRecords.Rows.Add(dtTemplateRecords.NewRow());

ViewState[viewStateGVName] = dtTemplateRecords;

gvTemplate.AllowSorting = false;

gvTemplate.DataSource = ViewState[viewStateGVName];

gvTemplate.DataBind();

//hide the 
checkbox and edit columns

gvTemplate.Columns[GVCHKBOX].Visible = false;

gvTemplate.Columns[GVEDITBTN].Visible = false;



int TotalColumns = 
gvTemplate.Rows[0].Cells.Count;

gvTemplate.Rows[0].Cells.Clear();

gvTemplate.Rows[0].Cells.Add(new TableCell());

gvTemplate.Rows[0].Cells[0].ColumnSpan = TotalColumns;

gvTemplate.Rows[0].Cells[0].Text = "No Record Found";

}





}

protected void 
gvTemplate_RowCreated(object sender, GridViewRowEventArgs e)

{

if (e.Row.RowType == DataControlRowType.Header)

{

GridView header = (GridView)sender;

GridViewRow gvr = new GridViewRow(0, 0, DataControlRowType.Header, DataControlRowState.Insert);

TableCell tCell = new TableCell();

tCell.Text = "Contract Management Templates";

tCell.ColumnSpan = 9;

tCell.HorizontalAlign = HorizontalAlign.Left;

tCell.CssClass = "trWithBorder";

gvr.Cells.Add(tCell);

// Add the 
Merged TableCell to the GridView Header 

Table tbl = gvTemplate.Controls[0] 
as Table;

if (tbl != null)

{

tbl.Rows.AddAt(0, gvr);

}

}



}

protected void 
gvTemplate_Sorting(object sender, GridViewSortEventArgs e)

{

GetSortDirection(e.SortExpression);

BindGrid(false);

}

private void 
GetSortDirection(string sColumn)

{

//set sort 
direction to asc

string sSortDirection = "ASC";

string sSortExpression = 
ViewState[this.ToString() +

"_SortExpression"] as string;

if (sSortExpression != null)

{

//check same 
column is being sorted

if (sSortExpression == sColumn)

{

string sLastDirection = ViewState[this.ToString() +

"_SortDirection"] as string;

if ((sLastDirection != null) 
&& (sLastDirection == "ASC"))

{

sSortDirection = "DESC";

}

}

}

//save new 
values in view

ViewState[this.ToString() + "_SortDirection"] = 
sSortDirection;

ViewState[this.ToString() + "_SortExpression"] 
= sColumn;

}





protected void 
gvTemplate_RowCommand(object sender, GridViewCommandEventArgs e)

{

if (e.CommandName.Equals("AddNew"))

{

TextBox txtTemplateID = (TextBox)gvTemplate.FooterRow.FindControl("txtTemplateID");

TextBox txtTemplateName = (TextBox)gvTemplate.FooterRow.FindControl("txtTemplateName");

TextBox txtFileName = (TextBox)gvTemplate.FooterRow.FindControl("txtFileName");

TextBox txtFilePath = (TextBox)gvTemplate.FooterRow.FindControl("txtFilePath");



Console.WriteLine(txtTemplateID.Text);

Console.WriteLine(txtTemplateName.Text);

Console.WriteLine(txtFileName.Text);

Console.WriteLine(txtFilePath.Text);







vrmdb.Insert_TemplateRecords(txtTemplateID.Text, txtTemplateName.Text, 
txtFileName.Text, txtFilePath.Text);



BindGrid(true);

Response.Redirect("ContractTemplate.aspx");

}

}



protected void 
gvTemplate_RowEditing(object sender, GridViewEditEventArgs e)

{

gvTemplate.EditIndex = e.NewEditIndex;

BindGrid(true);

}

protected void 
gvTemplate_RowUpdating(object sender, GridViewUpdateEventArgs e)

{

TextBox txtTemplateID = (TextBox)gvTemplate.Rows[e.RowIndex].FindControl("txtTemplateID");

TextBox txtFilePath = (TextBox)gvTemplate.Rows[e.RowIndex].FindControl("txtFilePath");







vrmdb.Update_TemplateRecords(txtTemplateID.Text,txtFilePath.Text);

gvTemplate.EditIndex = -1;

BindGrid(true); 

}

protected void 
gvTemplate_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)

{

gvTemplate.EditIndex = -1;

BindGrid(true);

}

protected void 
gvTemplate_RowDeleting(object sender, GridViewDeleteEventArgs e)

{

vrmdb.Delete_TemplateRecords(gvTemplate.DataKeys[e.RowIndex].Values[0].ToString());

BindGrid(true);

}

protected void 
AddBtn_Click(object sender, EventArgs e)

{

DataTable dtTemplateRecords = null;

if (dtTemplateRecords != null)

{

if (dtTemplateRecords.Rows.Count > 0)

{

ViewState[viewStateGVName] = dtTemplateRecords;

gvTemplate.DataSource = ViewState[viewStateGVName];

gvTemplate.DataBind();

}



}







}

}

}

This is the code that I use it for the Add Template btn such that when click on it will display the grid view:  

 

protected void AddBtn_Click(object sender, EventArgs e)   

    {   
       DataTable dtTemplateRecords = null;   
           if (dtTemplateRecords != null)   
            {
  

                if (dtTemplateRecords.Rows.Count > 0)   

                {
  
                    ViewState[viewStateGVName] = dtTemplateRecords;
  
                  gvTemplate.DataSource = ViewState[viewStateGVName];   
                    gvTemplate.DataBind();
  
                }
  

                 
           }
  

Thanks for helping me all these while:)