GridView rowdeleting dynamic add row, delete row record does not delete record in database

If you just delete the rows in the GridView, the records in the database are not deleted

Item Times	Work No.	name
1	10022936	Gracy.ma	Delete
2	10017300	Eric.mak	Delete

protected void Button1_Click (object sender, EventArgs e)
{
int rowCount = 1;
DataTable DT = new DataTable ();
DataRow DR;
Dt. Columns.Add ("Order_no");
Dt. Columns.Add ("Emp_no");
Dt. Columns.Add ("NAME");
for (int iRow = 0; IRow < GridView1.Rows.Count; irow++)
{
DR = DT. NewRow ();
Dr[0] = RowCount;
DR[1] = Gridview1.rows[irow]. CELLS[1]. Text.trim ();
DR[2] = Gridview1.rows[irow]. CELLS[2]. Text.trim ();
Dt. Rows.Add (DR);
rowcount++;
}

DR = DT. NewRow ();
Dr[0] = RowCount;
DR[1] = this. TextBox1.Text.Trim ();
DR[2] = this. TextBox2.Text.Trim ();
Dt. Rows.Add (DR);
Gridview1.datasource = DT;
Gridview1.databind ();
session["DataTable"] = DT;
}

protected void Gridview1_rowdeleting (object sender, Gridviewdeleteeventargs e)
{
DataTable dt= (DataTable) session["DataTable"];
Dt. Rows.removeat (E.rowindex);
Gridview1.datasource = DT;
Gridview1.databind ();
}

Article from http://mgracy.blog.163.com/blog/static/5764989820114811369947/

GridView rowdeleting dynamic add row, delete row record does not delete record in database