Tip 1: Add, Update, Delete Records in a GridView using SqlDataSource
By default, the GridView control doesn’t have support for inserting new records. However you can use the built-in edit or delete
functionality of the GridView control. Let us explore how to insert new records and Update and Delete existing records in
a GridView. Just copy and paste the
code in your project. We will be using the ‘Categories’ table in the ‘Northwind’ database.
GridView.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="GridView.aspx.cs" Inherits="GridView" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Grid View Add Update Delete</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="GridView1" runat="server"
AutoGenerateColumns="False" DataKeyNames="CategoryID"
DataSourceID="SqlDataSource1" ShowFooter="true"
AllowPaging="True" AllowSorting="True" OnRowCommand="GridView1_RowCommand">
<Columns>
<asp:CommandField ShowDeleteButton="True" ShowEditButton="True"/>
<asp:TemplateField HeaderText="CategoryID"
InsertVisible="False" SortExpression="CategoryID">
<EditItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Eval("CategoryID") %>'></asp:Label>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("CategoryID") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="CategoryName" SortExpression="CategoryName">
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("CategoryName") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%# Bind("CategoryName") %>'></asp:Label>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="CategoryNameTextBox" Runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Description" SortExpression="Description">
<EditItemTemplate>
<asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("Description") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label3" runat="server" Text='<%# Bind("Description") %>'></asp:Label>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="DescriptionTextBox" Runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:templatefield>
<footertemplate>
<asp:linkbutton id="btnNew" runat="server" commandname="New" text="New" />
</footertemplate>
</asp:templatefield>
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="Data Source=SUPROTIM;Initial Catalog=Northwind;Integrated Security=True"
DeleteCommand="DELETE FROM [Categories] WHERE [CategoryID] = @CategoryID"
InsertCommand="INSERT INTO [Categories] ([CategoryName], [Description]) VALUES (@CategoryName, @Description)"
ProviderName="System.Data.SqlClient"
SelectCommand="SELECT [CategoryID], [CategoryName], [Description] FROM [Categories]"
UpdateCommand="UPDATE [Categories] SET [CategoryName] = @CategoryName,
[Description] = @Description WHERE [CategoryID] = @CategoryID">
<DeleteParameters>
<asp:Parameter Name="CategoryID" Type="Int32" />
</DeleteParameters>
<UpdateParameters>
<asp:Parameter Name="CategoryName" Type="String" />
<asp:Parameter Name="Description" Type="String" />
<asp:Parameter Name="CategoryID" Type="Int32" />
</UpdateParameters>
<InsertParameters>
<asp:Parameter Name="CategoryName" Type="String" />
<asp:Parameter Name="Description" Type="String" />
</InsertParameters>
</asp:SqlDataSource>
</div>
</form>
</body>
</html>
GridView.aspx.cs
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
SqlConnection conn = new SqlConnection(
ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString);
try
{
if (e.CommandName.Equals("New"))
{
LinkButton btnNew = e.CommandSource as LinkButton;
GridViewRow row = btnNew.NamingContainer as GridViewRow;
if (row == null)
{
return;
}
TextBox txtCatName = row.FindControl("CategoryNameTextBox") as TextBox;
TextBox txtDescription = row.FindControl("DescriptionTextBox") as TextBox;
SqlCommand cmd = new SqlCommand(
"INSERT INTO [Categories] ([CategoryName], [Description]) VALUES (@CategoryName, @Description)",
conn);
cmd.Parameters.AddWithValue("CategoryName", txtCatName.Text);
cmd.Parameters.AddWithValue("Description",txtDescription.Text);
conn.Open();
if (cmd.ExecuteNonQuery() == 1)
{
GridView1.DataBind();
}
}
}
catch (Exception ex)
{
}
finally
{
conn.Close();
}
}
Web.config
<connectionStrings>
<add name="NorthwindConnectionString"
connectionString="Data Source =.;Integrated Security = SSPI; Initial Catalog=Northwind;"/>
</connectionStrings>
Tip 2: Paging and Sorting a GridView without Refreshing a Page
If you have created a GridView and have bound it to a data source control, you can avoid postback during sorting and paging by setting
the EnableSortingAndPagingCallbacks property of the GridView to True.
Just remember that when you set the EnableSortingAndPagingCallbacks property to true, you cannot use Template Fields in the GridView.
Tip 3: Pop-up a Confirmation box before Deleting a Row in GridView
Add a template field and drop a button in it, using which the user will delete the record. In the
OnClientClick event, call the confirm() function as mentioned below:
<asp:TemplateField>
<ItemTemplate>
<asp:Button ID="btnDel" runat="server" Text="Delete"
CommandName="Delete"
OnClientClick="return confirm('Are you sure you want to delete the record?');" />
</ItemTemplate>
</asp:TemplateField>
Tip 4: Display Details of the Row Selected in the GridView
Assuming you have a button called ‘Select’ in your GridView with CommandName ‘Select’, to find out the row clicked and display the row’s details, use this code:
C#:
private void GridView1_RowCommand(Object sender,
GridViewCommandEventArgs e)
{
if (e.CommandName == "Select")
{
int idx = Convert.ToInt32(e.CommandArgument);
GridViewRow selrow = GridView1.Rows[idx];
string fstCell = selrow.Cells[0].Text;
string scndCell = selrow.Cells[1].Text;
}
}
VB.NET
Private Sub GridView1_RowCommand(ByVal sender As Object, ByVal e As GridViewCommandEventArgs)
If e.CommandName = "Select" Then
Dim idx As Integer = Convert.ToInt32(e.CommandArgument)
Dim selrow As GridViewRow = GridView1.Rows(idx)
Dim fstCell As String = selrow.Cells(0).Text
Dim scndCell As String = selrow.Cells(1).Text
End If
End Sub
Tip 5: Retrieve Details of the Row Being Modified in GridView
C#
void GridView1_RowUpdated(Object sender, GridViewUpdatedEventArgs e)
{
int index = GridView1.EditIndex;
GridViewRow row = GridView1.Rows[index];
lblMsg.Text = "Updated record " + row.Cells[1].Text;
}
VB.NET
Private Sub GridView1_RowUpdated(ByVal sender As Object, ByVal e As GridViewUpdatedEventArgs)
Dim index As Integer = GridView1.EditIndex
Dim row As GridViewRow = GridView1.Rows(index)
lblMsg.Text = "Updated record " & row.Cells(1).Text
End Sub
Tip 6: Retrieve Details of the Row being Deleted in GridView
The ID of the row being deleted must be in the GridView.DataKeyNames collection.
C#
protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
int ID = (int)GridView1.DataKeys[e.RowIndex].Value;
}
VB.NET
Protected Sub GridView1_RowDeleting(ByVal _
sender As Object, ByVal e As GridViewDeleteEventArgs)
Dim ID As Integer = CInt(GridView1.DataKeys(e.RowIndex).Value)
End Sub
Tip 7: Cancelling Update and Delete in a GridView
RowUpdating - Occurs when a row's Update button is clicked, but before the GridView control updates the row.RowDeleting – Occurs when a row's Delete button is clicked, but before the GridView control deletes the row.
C#
protected void gvDetail_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
e.Cancel = true;
}
void GridView1_RowDeleting(Object sender, GridViewDeleteEventArgs e)
{
if (GridView1.Rows.Count <= 1)
{
e.Cancel = true;
}
}
VB.NET
Protected Sub gvDetail_RowUpdating(ByVal sender As Object, ByVal e As GridViewUpdateEventArgs)
e.Cancel = True
End Sub
Private Sub GridView1_RowDeleting(ByVal sender As Object, ByVal e As GridViewDeleteEventArgs)
If GridView1.Rows.Count <= 1 Then
e.Cancel = True
End If
End Sub
Tip 8: Paging and Sorting in GridView Without Using the DataSource Control
Original code author: Ryan Olshan.
C#
<asp:GridView ID="gridView" OnPageIndexChanging="gridView_PageIndexChanging"
OnSorting="gridView_Sorting" runat="server" />
private string ConvertSortDirectionToSql(SortDirection sortDireciton)
{
string newSortDirection = String.Empty;
switch (sortDirection)
{
case SortDirection.Ascending:
newSortDirection = "ASC";
break;
case SortDirection.Descending:
newSortDirection = "DESC";
break;
}
return newSortDirection
}
protected void gridView_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
gridView.PageIndex = e.NewPageIndex;
gridView.DataBind();
}
protected void gridView_Sorting(object sender, GridViewSortEventArgs e)
{
DataTable dataTable = gridView.DataSource as DataTable;
if (dataTable != null)
{
DataView dataView = new DataView(dataTable);
dataView.Sort = e.SortExpression + " " + ConvertSortDirectionToSql(e.SortDirection);
gridView.DataSource = dataView;
gridView.DataBind();
}
}
VB.NET
Private Function ConvertSortDirectionToSql(ByVal sortDireciton As SortDirection) As String
Dim newSortDirection As String = String.Empty
Select Case sortDirection
Case SortDirection.Ascending
newSortDirection = "ASC"
Case SortDirection.Descending
newSortDirection = "DESC"
End Select
Return newSortDirection
End Function
Protected Sub gridView_PageIndexChanging(ByVal sender As Object, ByVal e As GridViewPageEventArgs)
gridView.PageIndex = e.NewPageIndex
gridView.DataBind()
End Sub
Protected Sub gridView_Sorting(ByVal sender As Object, ByVal e As GridViewSortEventArgs)
Dim dataTable As DataTable = TryCast(gridView.DataSource, DataTable)
If Not dataTable Is Nothing Then
Dim dataView As DataView = New DataView(dataTable)
dataView.Sort = e.SortExpression & " " & ConvertSortDirectionToSql(e.SortDirection)
gridView.DataSource = dataView
gridView.DataBind()
End If
End Sub
Tip 9: Delete Multiple rows in a GridView
Check this article of mine over here.
Tip 10: Export GridView to Excel
C#
protected void Button1_Click(object sender, EventArgs e)
{
Response.AddHeader("content-disposition", "attachment;filename=FileName.xls");
Response.Charset = String.Empty;
Response.ContentType = "application/vnd.xls";
System.IO.StringWriter sw = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter hw = new HtmlTextWriter(sw);
GridView1.RenderControl(hw);
Response.Write(sw.ToString());
Response.End();
}
VB.NET
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs)
Response.AddHeader("content-disposition", "attachment;filename=FileName.xls")
Response.Charset = String.Empty
Response.ContentType = "application/vnd.xls"
Dim sw As System.IO.StringWriter = New System.IO.StringWriter()
Dim hw As System.Web.UI.HtmlTextWriter = New HtmlTextWriter(sw)
GridView1.RenderControl(hw)
Response.Write(sw.ToString())
Response.End()
End Sub
Well, that was a quick overview of some of the most frequently used features of the GridView control. I hope you liked the article and I thank you for viewing it.
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