Displaying ASPxGridView row index number

You can achieve this through two way:

Method 1

Step 1. Add ASPxGridView on your page:

<dx:ASPxGridView ID="grvTest" AutoGenerateColumns="False" runat="server"
DataSourceID="SqlDataSource1" onhtmlrowprepared="grvTest_HtmlRowPrepared"
onhtmlrowcreated="grvTest_HtmlRowCreated">
<Columns>
<dx:GridViewDataTextColumn Caption="RowID" Name="colRowID" VisibleIndex="0"
Width="20px">
<DataItemTemplate>
<dx:ASPxLabel ID="lblRowID" runat="server" Text="lablel">
</dx:ASPxLabel>
</DataItemTemplate>
</dx:GridViewDataTextColumn>
<dx:GridViewDataTextColumn Caption="User Name" FieldName="UserName"
Name="colUserName" VisibleIndex="1" Width="100px">
</dx:GridViewDataTextColumn>
<dx:GridViewDataTextColumn Caption="Password" FieldName="Password"
Name="colPassword" VisibleIndex="2" Width="30px">
</dx:GridViewDataTextColumn>
<dx:GridViewDataTextColumn Caption="Role" FieldName="Role" Name="colRole"
VisibleIndex="3" Width="30px">
</dx:GridViewDataTextColumn>
</Columns>
</dx:ASPxGridView>

Step 2: Add following ASPxGridView Event code snippet to your code – behind file (.cs)

protected void grvTest_HtmlRowCreated(object sender, ASPxGridViewTableRowEventArgs e)
{
if (e.RowType != GridViewRowType.Data) return;

ASPxLabel label = grvTest.FindRowCellTemplateControl(e.VisibleIndex, null, "lblRowID") as ASPxLabel;
label.Text = (e.VisibleIndex + 1).ToString();
}

Method 2

The another way to do it is this one in the Columns section of your GridView control:

<dx:ASPxGridView ID="grvTest" AutoGenerateColumns="False" runat="server"
DataSourceID="SqlDataSource1" >
<Columns>
<dx:GridViewDataTextColumn Caption="RowID" Name="colRowID" VisibleIndex="0"
Width="20px">
<DataItemTemplate>
<dx:ASPxLabel ID="lblRowID" runat="server" Text='<%# Container.ItemIndex + 1 %>'>
</dx:ASPxLabel>
</DataItemTemplate>
</dx:GridViewDataTextColumn>

Displaying ASP GridView row index number

You can achieve this through two way:

Method 1

Step 1. Add this your GridView:

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="id"
DataSourceID="SqlDataSource1" OnRowCreated="GridView1_RowCreated" >

<Columns>
<asp:TemplateField HeaderText="RowId">
<ItemTemplate><asp:Label runat="server" />                      
</ItemTemplate>            
</asp:TemplateField> 
...
</Columns>

Step 2: Add following GridView Event code snippet to your code – behind file (.cs)

protected void GridView1_RowCreated(object sender, 
System.Web.UI.WebControls.GridViewRowEventArgs e)
{ 
if (e.Row.RowType == DataControlRowType.DataRow) {
// Retrieve the Label from the first column.
Label myLabel = (Label)e.Row.Cells[0].Controls[0]; 

// Set Label text equal to the rowIndex +1
myLabel.Text = e.Row.RowIndex.ToString() + 1; 
}
}

Method 2

The another way to do it is this one in the Columns section of your GridView control:

<asp:GridView ID="GridView1" runat="server" AllowPaging="True" AllowSorting="True"
AutoGenerateColumns="False" DataSourceID="SqlDataSource1" PageSize="5">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<%# Container.DataItemIndex + 1 %>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="CategoryName" HeaderText="CategoryName" SortExpression="CategoryName" />
<asp:BoundField DataField="Description" HeaderText="Description" SortExpression="Description" />
</Columns>
</asp:GridView>