How do I remove this blank space from gridview in ASP.NET?

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C#

ASP.NET

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How do i remove this blank space from gridview in asp.net?

please see this IMAGE

I want to remove this blank white space NOT hide this(as I know we can hide this border very easily)

even after hiding the border the white unused space is there
i want to remove that

please see this IMAGE

my gridview code is :-

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" DataKeyNames="OrderID" OnRowDataBound="FindGridAndBound" GridLines="Horizontal">
				<AlternatingRowStyle BackColor="#F7F7F7" />
				<Columns>
					<asp:TemplateField>
						<ItemTemplate>
							<asp:GridView ID="GridViewNested" runat="server" AutoGenerateColumns="true" EnableViewState="false" 
								Width="100%" BackColor="Aquamarine" />
						</ItemTemplate>
					</asp:TemplateField>
				</Columns>
			</asp:GridView>

code behind :- [i have taken this code from this Tutorial VIDEO]

using NoshCart.DataLayer;
using System;
using System.Data;
using System.Data.SqlClient;
using System.Web.UI.WebControls;

namespace NoshCart.Account
{
    public partial class WebForm2 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                GetData();
            }
        }

        private void GetData()
        {
            //creating the sqlparameter object
            SqlParameter[] parameters = new SqlParameter[1];

            //adding the parameters
            parameters[0] = DataAccess.AddParameter("@custid", Convert.ToInt64(Session["Id"]), SqlDbType.BigInt, 20);

            //executing the Stored Procedure
            DataTable table = DataAccess.ExecuteDTByProcedure("SP_GetOrderIDNumbers", parameters);

            if (table.Rows.Count > 0)
            {
                GridView1.Visible = true;
                GridView1.DataSource = table;
                GridView1.DataBind();

            }
            else
            {
                LabelDataNotFound.Visible = true;
                LabelDataNotFound.Text = "No Orders Found";
            }
        }

        protected void FindGridAndBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType != DataControlRowType.DataRow) return;

            GridView nestedGridView = (GridView)e.Row.FindControl("GridViewNested");
            
            int ordid = int.Parse(GridView1.DataKeys[e.Row.RowIndex].Value.ToString());

            //creating the sqlparameter object
            SqlParameter[] parameters = new SqlParameter[2];

            //adding the parameters
            parameters[0] = DataAccess.AddParameter("@custid", Convert.ToInt64(Session["Id"]), SqlDbType.BigInt, 20);
            parameters[1] = DataAccess.AddParameter("@orderid", Convert.ToInt64(ordid), SqlDbType.BigInt, 20);

            //executing the Stored Procedure
            DataTable table = DataAccess.ExecuteDTByProcedure("SP_GetAllOrderDetails", parameters);

            nestedGridView.DataSource = table;
            nestedGridView.DataBind();
        }
    }
}

AddParameter method :-

public static SqlParameter AddParameter(string parameterName, object value, SqlDbType DbType, int size)
        {
            SqlParameter param = new SqlParameter();
            param.ParameterName = parameterName;
            param.Value = value.ToString();
            param.SqlDbType = DbType;
            param.Size = size;
            param.Direction = ParameterDirection.Input;
            return param;
        }

ExecuteDTByProcedure method :-

public static DataTable ExecuteDTByProcedure(string ProcedureName,SqlParameter[] Params)
  {
      SqlConnection conn = new SqlConnection(ConnectionString);
      SqlCommand cmd = new SqlCommand();
      cmd.Connection = conn;
      cmd.CommandText = ProcedureName;
      cmd.Parameters.AddRange(Params);
      cmd.CommandType = CommandType.StoredProcedure;
      SqlDataAdapter adopter = new SqlDataAdapter(cmd);
      DataTable dTable = new DataTable();

      try
      {
          adopter.Fill(dTable);
      }

      catch (Exception ex)
      {
          string str = ex.Message;
      }

      finally
      {

          adopter.Dispose();
          cmd.Parameters.Clear();
          cmd.Dispose();
          conn.Dispose();
      }
      return dTable;
  }

please help

thanks :)

What I have tried:

i have tried many thing but NONE of these are working at all

e.Row.Cells[0].Visible = false;

gridView1.Columns[0].Visible = false;

RowHeadersVisible = "false"

ColumnHeadersVisible = "false"