Refresh GridView after Inserting data into database without page Load in ASP.Net

Hi akhter,

Check this sample now take its reference and correct your code.

HTML

<asp:ScriptManager ID="scriptManager1" runat="server" />
<asp:UpdatePanel ID="updatePanel1" runat="server">
    <ContentTemplate>
        Name :<asp:TextBox ID="txtName" runat="server" /><br />
        Country :<asp:TextBox ID="txtCountry" runat="server" /><br />
        <asp:Button ID="btnSave" Text="Save" runat="server" OnClick="OnSave" /><br /><br />
        <asp:GridView runat="server" ID="gvCustomers">
        </asp:GridView>
    </ContentTemplate>
</asp:UpdatePanel>

Namespaces

C#

using System.Data;

VB.net

Imports System.Data

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        if (ViewState["dt"] != null)
        {
            this.BindCustomers();
        }
    }
}

protected void OnSave(object sender, EventArgs e)
{
    DataTable dt = new DataTable();
    if (ViewState["dt"] == null)
    {
        dt.Columns.AddRange(new DataColumn[] { new DataColumn("Name"), new DataColumn("Country") });
        dt.Rows.Add(txtName.Text.Trim(), txtCountry.Text.Trim());
        ViewState["dt"] = dt;
    }
    else
    {
        dt = ViewState["dt"] as DataTable;
        dt.Rows.Add(txtName.Text.Trim(), txtCountry.Text.Trim());
    }
    this.BindCustomers();
    this.txtName.Text = string.Empty;
    this.txtCountry.Text = string.Empty;
}

private void BindCustomers()
{
    this.gvCustomers.DataSource = ViewState["dt"] as DataTable;
    this.gvCustomers.DataBind();
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        If ViewState("dt") IsNot Nothing Then
            Me.BindCustomers()
        End If
    End If
End Sub

Protected Sub OnSave(ByVal sender As Object, ByVal e As EventArgs)
    Dim dt As DataTable = New DataTable()
    If ViewState("dt") Is Nothing Then
        dt.Columns.AddRange(New DataColumn() {New DataColumn("Name"), New DataColumn("Country")})
        dt.Rows.Add(txtName.Text.Trim(), txtCountry.Text.Trim())
        ViewState("dt") = dt
    Else
        dt = TryCast(ViewState("dt"), DataTable)
        dt.Rows.Add(txtName.Text.Trim(), txtCountry.Text.Trim())
    End If
    Me.BindCustomers()
    Me.txtName.Text = String.Empty
    Me.txtCountry.Text = String.Empty
End Sub

Private Sub BindCustomers()
    Me.gvCustomers.DataSource = TryCast(ViewState("dt"), DataTable)
    Me.gvCustomers.DataBind()
End Sub

Screenshot

akhter says:

this.GridView1.DataBind();

You need to call the GridView binding code again instead of only DataBind method.