Make ASP.Net GridView last column Editable using C#

Hi ramco1917,

Please refer below sample.

HTML

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" OnRowDataBound="OnRowDataBound">
</asp:GridView>

Namespace

C#

using System.Data;

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        BoundField bfield = new BoundField();
        bfield.HeaderText = "Name";
        bfield.DataField = "Name";
        GridView1.Columns.Add(bfield);

        TemplateField tfield = new TemplateField();
        tfield.HeaderText = "Country";
        GridView1.Columns.Add(tfield);
    }
    this.BindGrid();
}
private void BindGrid()
{
    DataTable dt = new DataTable();
    dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Id", typeof(int)),
                    new DataColumn("Name", typeof(string)),
                    new DataColumn("DOB",typeof(DateTime)) });
    dt.Rows.Add(1, "John Hammond", "2023-04-01");
    dt.Rows.Add(2, "Mudassar Khan", "2023-04-01");
    GridView1.DataSource = dt;
    GridView1.DataBind();
}
protected void OnRowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        TextBox txtDOB = new TextBox();
        txtDOB.ID = "txtDOB";
        txtDOB.Text = (e.Row.DataItem as DataRowView).Row["DOB"].ToString();
        e.Row.Cells[1].Controls.Add(txtDOB);
    }
}

Screenshot