Prevent losing the value of the TextBox of the GridView

Question

I had been looking for the solution been a month. I have surfed all the related post which seems similar but doesn’t match my requirement. Therefore I am posting this query which will sound similar to the old post that other friends might have posted, however it doesn’t meet my problem.

I am binding a data in Grid View (Name : GridView3) where I am using Bound Field to get the data, I have a checkbox in this Grid View and On Checked Changed I am creating a Data Table and passing the value of this Bound Field in new Grid View (Name: GridView4). I am using Template Field in GridView4 to bind the value passed from GridView3, but in GridView4 I have added one extra Template Field which is a Text Box which doesn’t get value from Gridview3, here I am typing the value manually as per my requirement. The problem is, the value which I am typing manually in Text Box get lost whenever I try to add new row in GridView4 from On Checked Changed event of GridView3. So, how do I stop losing the value of this particular Text Box on Post Back?

 

Here is my Grid View:
GridView3:


<asp:GridView ID="GridView3" runat="server" AllowPaging="True" AutoGenerateColumns="False" BackColor="White" BorderColor="#999999" CssClass="tableAdmin" BorderStyle="Solid" BorderWidth="1px" CellPadding="0" ForeColor="Black" GridLines="Vertical" ShowHeaderWhenEmpty="True" EmptyDataText="No records Found">
<AlternatingRowStyle BackColor="#CCCCCC" />
<Columns>
<asp:TemplateField>
<HeaderTemplate>
<asp:CheckBox ID="chkAll" runat="server" Enabled="true" onclick="checkAll(this);" AutoPostBack="true" OnCheckedChanged="CheckBox_CheckChanged" />
</HeaderTemplate>
<ItemTemplate>
<asp:CheckBox ID="chk" runat="server" onclick="Check_Click(this)" AutoPostBack="true" OnCheckedChanged="CheckBox_CheckChanged" />
</ItemTemplate>
<HeaderStyle Width="10%" />
<ItemStyle Width="10%" />
</asp:TemplateField>
<asp:BoundField DataField="AId" HeaderText="AId" Visible="true" HtmlEncode="false">
<HeaderStyle Width="20%" />
<ItemStyle Width="20%" />
</asp:BoundField>
<asp:BoundField DataField="AssetsName" HeaderText="Product" HtmlEncode="false">
<HeaderStyle Width="20%" />
<ItemStyle Width="20%" />
</asp:BoundField>
<asp:BoundField DataField="SubAssetName" HeaderText="Product_Type" HtmlEncode="false">
<ItemStyle Width="20%" />
<HeaderStyle Width="20%" />
</asp:BoundField>
</Columns>
<FooterStyle BackColor="#CCCCCC" />
<HeaderStyle BackColor="Black" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#999999" ForeColor="Black" HorizontalAlign="Center" />
<SelectedRowStyle BackColor="#000099" Font-Bold="True" ForeColor="White" />
<SortedAscendingCellStyle BackColor="#F1F1F1" />
<SortedAscendingHeaderStyle BackColor="#808080" />
<SortedDescendingCellStyle BackColor="#CAC9C9" />
<SortedDescendingHeaderStyle BackColor="#383838" />
</asp:GridView>


GridView4



<asp:GridView ID="GridView4" runat="server" Font-Names="Arial" Font-Size="11pt" BackColor="White" BorderColor="#999999" CssClass="tableAdmin" BorderStyle="Solid" BorderWidth="1px" AllowPaging="True" EmptyDataText="No Product Selected" AutoGenerateColumns="False"
CellPadding="3" ForeColor="Black" GridLines="Vertical">
<AlternatingRowStyle BackColor="#CCCCCC" />
<Columns>
<asp:TemplateField HeaderText="AId" Visible="false">
<ItemTemplate>
<asp:Label ID="lblAId" runat="server" Text='<%# Bind("AId") %>'></asp:Label>
<asp:TextBox ID="txtGAId" runat="server" Text='<%# Bind("AId") %>' Visible="false"></asp:TextBox>
</ItemTemplate>
<ControlStyle Width="10%" />
<HeaderStyle Width="10%" />
<ItemStyle Width="10%" />
</asp:TemplateField>
<asp:TemplateField HeaderText="Product">
<ItemTemplate>
<asp:Label ID="lblAssetsName" runat="server" Text='<%# Bind("AssetsName") %>'></asp:Label>
<asp:TextBox ID="txtGAssetsName" runat="server" Text='<%# Bind("AssetsName") %>'
Visible="false"></asp:TextBox>
</ItemTemplate>
<ControlStyle Width="100%" />
<HeaderStyle Width="15%" />
<ItemStyle Width="20%" />
</asp:TemplateField>
<asp:TemplateField HeaderText="Sub_Product">
<ItemTemplate>
<asp:Label ID="lblSubAssetName" runat="server" Text='<%# Bind("SubAssetName") %>'></asp:Label>
<asp:TextBox ID="txtGSubAssetName" runat="server" Text='<%# Bind("SubAssetName") %>'
Visible="false"></asp:TextBox>
</ItemTemplate>
<ControlStyle Width="100%" />
<HeaderStyle Width="10%" />
<ItemStyle Width="10%" />
</asp:TemplateField>
<asp:TemplateField HeaderText="Price" Visible="true" ItemStyle-VerticalAlign="Top">
<ItemTemplate>
<asp:TextBox ID="txtPrice" runat="server" ReadOnly="true" CssClass="tableAdminTextBox"Visible="true">
</asp:TextBox>
</ItemTemplate>
<ControlStyle Width="100%" />
<HeaderStyle Width="8%" />
<ItemStyle Width="8%" />
</asp:TemplateField>
</Columns>
<FooterStyle BackColor="#CCCCCC" BorderWidth="1px" BorderColor="Black" />
<HeaderStyle BackColor="Black" Font-Bold="True" ForeColor="White"></HeaderStyle>
<PagerStyle BackColor="#999999" ForeColor="Black" HorizontalAlign="Center" />
<SelectedRowStyle BackColor="#000099" Font-Bold="True" ForeColor="White" />
<SortedAscendingCellStyle BackColor="#F1F1F1" />
<SortedAscendingHeaderStyle BackColor="#808080" />
<SortedDescendingCellStyle BackColor="#CAC9C9" />
<SortedDescendingHeaderStyle BackColor="#383838" />

</asp:GridView>

 

Below is the code behind:

protected void CheckBox_CheckChanged(object sender, EventArgs e)
{
pnl_InProduct.Visible = true;
GetData();
SetData();
BindSecondaryGrid();
}

private DataTable CreateDataTable()
{
DataTable dt = new DataTable();
dt.Columns.Add("AId");
dt.Columns.Add("AssetsName");
dt.Columns.Add("SubAssetName");
dt.AcceptChanges();
return dt;
}

private DataTable AddRow(GridViewRow gvRow, DataTable dt)
{
DataRow[] dr = dt.Select("AId = '" + gvRow.Cells[1].Text + "'");
if (dr.Length <= 0)
{
dt.Rows.Add();
dt.Rows[dt.Rows.Count - 1]["AId"] = gvRow.Cells[1].Text;
dt.Rows[dt.Rows.Count - 1]["AssetsName"] = gvRow.Cells[2].Text;
dt.Rows[dt.Rows.Count - 1]["SubAssetName"] = gvRow.Cells[3].Text;
dt.AcceptChanges();
}
return dt;
}

private DataTable RemoveRow(GridViewRow gvRow, DataTable dt)
{
DataRow[] dr = dt.Select("AId = '" + gvRow.Cells[1].Text + "'");
if (dr.Length > 0)
{
dt.Rows.Remove(dr[0]);
dt.AcceptChanges();
}
return dt;
}


private void GetData()
{
DataTable dt;
if (ViewState["SelectedRecords"] != null)
dt = (DataTable)ViewState["SelectedRecords"];
else
dt = CreateDataTable();
CheckBox chkAll = (CheckBox)GridView3.HeaderRow.Cells[0].FindControl("chkAll");
for (int i = 0; i < GridView3.Rows.Count; i++)
{
if (chkAll.Checked)
{
dt = AddRow(GridView3.Rows[i], dt);
}
else
{
CheckBox chk = (CheckBox)GridView3.Rows[i].Cells[0].FindControl("chk");
if (chk.Checked)
{
dt = AddRow(GridView3.Rows[i], dt);
}
else
{
dt = RemoveRow(GridView3.Rows[i], dt);
}
}
}
ViewState["SelectedRecords"] = dt;
}

private void SetData()
{
CheckBox chkAll = (CheckBox)GridView3.HeaderRow.Cells[0].FindControl("chkAll");
chkAll.Checked = true;
if (ViewState["SelectedRecords"] != null)
{
DataTable dt = (DataTable)ViewState["SelectedRecords"];
for (int i = 0; i < GridView3.Rows.Count; i++)
{
CheckBox chk = (CheckBox)GridView3.Rows[i].Cells[0].FindControl("chk");
if (chk != null)
{
DataRow[] dr = dt.Select("AId = '" + GridView3.Rows[i].Cells[1].Text + "'");
chk.Checked = dr.Length > 0;
if (!chk.Checked)
{
chkAll.Checked = false;
}
}
}
}
}

private void BindSecondaryGrid()
{
DataTable dt = (DataTable)ViewState["SelectedRecords"];
GridView4.DataSource = dt;
GridView4.DataBind();
}