Insert (Save) Records to GridView without PostBack in ASP.Net

Hi sg0176,

I have made one sample that full-fill your requirement.

HTML

<div>
    <asp:ScriptManager ID="scriptManager" runat="server">
    </asp:ScriptManager>
    <asp:UpdatePanel runat="server" ID="upMain" UpdateMode="Conditional" ChildrenAsTriggers="true">
        <ContentTemplate>
            <table>
                <tr>
                    <td>
                        Name:
                    </td>
                    <td>
                        <asp:TextBox runat="server" ID="txtName" />
                    </td>
                </tr>
                <tr>
                    <td>
                        Age:
                    </td>
                    <td>
                        <asp:TextBox runat="server" ID="txtAge" />
                    </td>
                </tr>
            </table>
            <br />
            <asp:LinkButton ID="lnkSubmit" runat="server" OnClick="lnkSubmit_Click">Save</asp:LinkButton>
            <br />
            <br />
            <asp:GridView runat="server" ID="gvDetails" AutoGenerateColumns="false">
                <Columns>
                    <asp:BoundField DataField="NAME" HeaderText="Name" />
                    <asp:BoundField DataField="AGE" HeaderText="Age" />
                </Columns>
            </asp:GridView>
        </ContentTemplate>
        <Triggers>
            <asp:AsyncPostBackTrigger ControlID="lnkSubmit" EventName="Click" />
        </Triggers>
    </asp:UpdatePanel>
</div>

Code

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        this.GetDetails();
    }
}
private void GetDetails()
{
    string constr = ConfigurationManager.ConnectionStrings["conString"].ToString();
    using (SqlConnection con = new SqlConnection(constr))
    {
        con.Open();
        using (SqlCommand cmd = new SqlCommand())
        {
            cmd.CommandText = "SELECT * FROM MYTEST";
            cmd.Connection = con;
            cmd.CommandType = CommandType.Text;
            SqlDataAdapter sda = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();
            sda.Fill(dt);
            this.gvDetails.DataSource = dt;
            this.gvDetails.DataBind();
            con.Close();
        }
    }
}
protected void lnkSubmit_Click(object sender, EventArgs e)
{
    string constr = ConfigurationManager.ConnectionStrings["conString"].ToString();
    using (SqlConnection con = new SqlConnection(constr))
    {
        con.Open();
        using (SqlCommand cmd = new SqlCommand())
        {
            cmd.CommandText = "INSERT INTO MYTEST VALUES (@Name,@Age)";
            cmd.Connection = con;
            cmd.CommandType = CommandType.Text;
            cmd.Parameters.AddWithValue("@Name", txtName.Text);
            cmd.Parameters.AddWithValue("@Age", txtAge.Text);
            cmd.ExecuteNonQuery();
            con.Close();
        }
    }
    txtName.Text = string.Empty;
    txtAge.Text = string.Empty;
    this.GetDetails();
}

Screenshot