How to merge Column Titles of the datagridview in ASP. NET)

How to merge the Column Titles of the datagridview in ASP. NET is as follows:

 

 

Protected void gridview1_rowcreated (Object sender, gridviewroweventargs E)
{
Switch (E. Row. rowtype)
{
Case datacontrolrowtype. header:
// Header of the first line
Tablecellcollection tcheader = E. Row. cells;
Tcheader. Clear ();

Tcheader. Add (New tableheadercell ());
// Cross 3 rows
Tcheader [0]. Attributes. Add ("rowspan", "3 ");
Tcheader [0]. Attributes. Add ("bgcolor", "White ");
Tcheader [0]. Text = "";

Tcheader. Add (New tableheadercell ());
// Cross-6 Columns
Tcheader [1]. Attributes. Add ("colspan", "6 ");
Tcheader [1]. Text = "All Information </th </tr> <tr> ";

// The header of the second row
Tcheader. Add (New tableheadercell ());
Tcheader [2]. Attributes. Add ("bgcolor", "darkseagreen ");
Tcheader [2]. Text = "ID card number ";

Tcheader. Add (New tableheadercell ());
Tcheader [3]. Attributes. Add ("bgcolor", "lightsteelbule ");
Tcheader [3]. Attributes. Add ("colspan", "2 ");
Tcheader [3]. Text = "Basic Information ";

Tcheader. Add (New tableheadercell ());
Tcheader [4]. Attributes. Add ("bgcolor", "darkseagreen ");
Tcheader [4]. Text = "welfare ";

Tcheader. Add (New tableheadercell ());
Tcheader [5]. Attributes. Add ("bgcolor", "lightsteelbule ");
Tcheader [5]. Attributes. Add ("colspan", "2 ");
Tcheader [5]. Text = "Contact Information </Th> </tr> <tr> ";

// Header of the third row
Tcheader. Add (New tableheadercell ());
Tcheader [6]. Attributes. Add ("bgcolor", "khaki ");
Tcheader [6]. Text = "ID card number ";

Tcheader. Add (New tableheadercell ());
Tcheader [7]. Attributes. Add ("bgcolor", "khaki ");
Tcheader [7]. Text = "name ";

Tcheader. Add (New tableheadercell ());
Tcheader [8]. Attributes. Add ("bgcolor", "khaki ");
Tcheader [8]. Text = "Date of Birth ";

Tcheader. Add (New tableheadercell ());
Tcheader [9]. Attributes. Add ("bgcolor", "khaki ");
Tcheader [9]. Text = "salary ";

Tcheader. Add (New tableheadercell ());
Tcheader [10]. Attributes. Add ("bgcolor", "khaki ");
Tcheader [10]. Text = "Home Address ";

Tcheader. Add (New tableheadercell ());
Tcheader [11]. Attributes. Add ("bgcolor", "khaki ");
Tcheader [11]. Text = "zip code ";

Break;
}
}