How to spilt the column names in DataTable

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C#

Sir,
below is my code for creating columns in datatable from textboxes.i want to show this textboxes data in same columns.i do that.but the problem is how to show the column names like
eg:
test this is data from first textbox
01 this is data from second textbox
if anyone knows the answer please help me....

protected void btnSave_Click(object sender, EventArgs e)
      {
          dt.Columns.Add(txtnm.Text+"\n"+"grade"+txtgrade.Text);
          dt.Rows.Add("ROWS");
          gvAlumni.DataSource = dt;
          gvAlumni.DataBind();
          txtnm.Text = "";
          txtgrade.Text = "";

      }

[edit]SHOUTING removed - OriginalGriff [/edit]