Using RequiredFieldValidator in GridView TemplateField in ASP.Net

Hi meetsree83,

No there is no other way to validate. You have to use RequiredFieldValidator.

Please refer below sample, In below sample explain about how to use RequiredFieldValidator inside TemplateField.

HTML

<asp:GridView ID="gvCustomers" runat="server" AutoGenerateColumns="false">
    <Columns>
        <asp:BoundField DataField="Id" HeaderText="Id" />
        <asp:BoundField DataField="Name" HeaderText="Name" />
        <asp:TemplateField HeaderText="Country">
            <ItemTemplate>
                <asp:TextBox ID="txtCountry" Text='<%# Eval("Country") %>' runat="server"></asp:TextBox>
                <asp:RequiredFieldValidator ID="rfvCountry" runat="server" ControlToValidate="txtCountry"
                    ErrorMessage="Fill Data" ForeColor="#ff3300"></asp:RequiredFieldValidator>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

Namespaces

C#

using System;
using System.Data;

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[3] 
        { 
                        new DataColumn("Id", typeof(int)),
                        new DataColumn("Name", typeof(string)),
                        new DataColumn("Country",typeof(string)) 
        });
        dt.Rows.Add(1, "John Hammond", "United States");
        dt.Rows.Add(2, "Mudassar Khan", "India");
        dt.Rows.Add(3, "Suzanne Mathews", "France");
        dt.Rows.Add(4, "Robert Schidner", null);
        this.gvCustomers.DataSource = dt;
        this.gvCustomers.DataBind();
    }
}

For more details refer below article.

Using ASP.Net RequiredFieldValidator for TextBox inside GridView TemplateField ItemTemplate