Data not persisting in gridview

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ASP.NET

I am creting a page,which has a gridview. I am binding a dynamic DataTable to this gridview.
e.g:
for adding new row in gridview,I am using following code:

DataRow NewRow = objDT.NewRow();
 NewRow[0] = "";
 NewRow[1] = "Space";
 NewRow[2] = false;
 objDT.Rows.Add(NewRow);
foreach (GridViewRow GVwRow in GVwEquipFrnt.Rows)
 {
   TextBox objTxt = (TextBox)GVwRow.FindControl("TxtWidthFrt");
   NewRow["EBBWidth"] = objTxt.Text;
 }
objDT.GetChanges(DataRowState.Added);
ViewState["Tbl"] = objDT;

this.GVwEquipFrnt.DataSource = objDT;
this.GVwEquipFrnt.DataBind();

problem is i am getting first row of grid is blank. I want to bind updated DataTable to gridview in same event.

Please help.

Thanks in advance.