Text Control in Gridview

To set the default value of the `TextBox` control to an empty string ("") in the `GridView`, you can use the `Text` property of the `TextBox` control. You can set the `Text` property of the `TextBox` control to an empty string in the `RowDataBound` event handler of the `GridView`. In this example, the `Text` property of the `TextBox` control is set to an empty string in the `RowDataBound` event handler. This will set the default value of the `TextBox` control to an empty string for each row in the `GridView`.
 

protected void gr_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        TextBox txtDate = new TextBox();
        txtDate.CssClass = "form-control";
        txtDate.Text = ""; // Set default value to an empty string
        e.Row.Cells[e.Row.Cells.Count - 1].Controls.Add(txtDate);
    }
}