Asp.net Gridview : Replace NULL or Empty values with other/message text

In this article I am going to explain how to replace NULL or Empty values with other/message text in Asp.net Gridview.
.
Description:

When we are displaying records in Gridview, some of fields have null value.  I want to show -–NA—on the instead of empty column. We have 2 options to achieve this. If we are using Boundfield in that case we can use NullDisplayText property.
2nd option to write the code on RowDatabound event of Gridview.
Implementations:

HTML Markup of Webform:

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">

</head>
<body>
    <form id="form1" runat="server">
    <div>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
            onrowdatabound="GridView1_RowDataBound" CellPadding="4" ForeColor="#333333" GridLines="None">
          <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
        <Columns>
        <asp:BoundField DataField="name" HeaderText="Name" NullDisplayText="--NA--">
            <HeaderStyle HorizontalAlign="Left" />
            <ItemStyle VerticalAlign="Middle" />
            </asp:BoundField>
        <asp:BoundField DataField="genre" HeaderText="Genre" NullDisplayText="--NA--">
            <HeaderStyle HorizontalAlign="Left" />
            </asp:BoundField>    
            <asp:TemplateField HeaderText="Genre (NA)">
                <ItemTemplate>
                    <asp:Label ID="lblgenre" runat="server" Text='<%#Eval("genre") %>'></asp:Label>
                </ItemTemplate>              
                <HeaderStyle HorizontalAlign="Left" />
            </asp:TemplateField>
               <asp:BoundField DataField="Budget" HeaderText="Budget" NullDisplayText="--NA--">
            <HeaderStyle HorizontalAlign="Left" />
            </asp:BoundField>
        </Columns>
          <EditRowStyle BackColor="#999999" />
          <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
          <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
          <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
          <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
          <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
          <SortedAscendingCellStyle BackColor="#E9E7E2" />
          <SortedAscendingHeaderStyle BackColor="#506C8C" />
          <SortedDescendingCellStyle BackColor="#FFFDF8" />
          <SortedDescendingHeaderStyle BackColor="#6F8DAE" />
        </asp:GridView>
    </form>
</body>
</html>


Add namespace

C# Code:
using System.Configuration;
using System.Data.SqlClient;
using System.Data;

VB.net Code:
Imports System.Configuration
Imports System.Data.SqlClient
Imports System.Data

Bind Gridview
Create a method to bind gridview and call it on page load event.

C# Code:
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["connection"].ToString());
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            BindGrid();
        }
    }
    private void BindGrid()
    {
        SqlDataAdapter adp = new SqlDataAdapter("SpGetMovie", con);
        adp.SelectCommand.CommandType = CommandType.StoredProcedure;
        DataTable dt = new DataTable();
        adp.Fill(dt);
        if (dt.Rows.Count > 0)
        {
            GridView1.DataSource = dt;
            GridView1.DataBind();
        }
    }

VB.net Code:
Dim con As New SqlConnection(ConfigurationManager.ConnectionStrings("connection").ToString())
    Protected Sub Page_Load(sender As Object, e As System.EventArgs) Handles Me.Load
        If Not IsPostBack Then
            BindGrid()
        End If
    End Sub
    Private Sub BindGrid()
        Dim adp As New SqlDataAdapter("SpGetMovie", con)
        adp.SelectCommand.CommandType = CommandType.StoredProcedure
        Dim dt As New DataTable()
        adp.Fill(dt)
        If dt.Rows.Count > 0 Then
            GridView1.DataSource = dt
            GridView1.DataBind()
        End If
    End Sub

Replace null/empty field with other/message text
On RowdataBound write the below given code:

C# Code:

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            Label lblNAgenre = (Label)e.Row.Cells[0].FindControl("lblgenre");
            if (lblNAgenre.Text == "")
            {
                lblNAgenre.Text = "--NA--";
            }
        } 
    }


VB.net Code:

Protected Sub GridView1_RowDataBound(sender As Object, e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound
        If e.Row.RowType = DataControlRowType.DataRow Then
            Dim lblNAgenre As Label = DirectCast(e.Row.Cells(0).FindControl("lblgenre"), Label)
            If lblNAgenre.Text = "" Then
                lblNAgenre.Text = "--NA--"
            End If
        End If
    End Sub



Result:

Asp.net Gridview : Replace NULL or Empty values with other/message text


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