Asp. NET to display the data in the TextBox through the GridView selection button

HTML code:

<asp:gridview id= "GridView1" runat= "Server" datakeynames= "CKDH" height= "183px" style= "left:0px";
           position:relative; Top: -18px; Font-size:small; "
            Width= "864px" allowpaging= "true" allowsorting= "true" autogeneratecolumns= "False" datasourceid= "SqlDataSource1" autogenerateselectbutton= "True" cellpadding= "4" forecolor= "#333333" gridlines= "None" onselectedindexchanging= " Gridview1_selectedindexchanging "emptydatatext=" not entered "> <pagerstyle horizontalalign=" Right "BackColor=" #FFC C66 "forecolor=" #333333 "/> <pagersettings mode=" Nextpreviousfirstlast "firstpagetext=" first page "Previouspaget ext= "Previous page" nextpagetext= "Next" lastpagetext= "last Page"/> <Columns> <asp:boundfield Data Field= "CKDH" headertext= "out of the library number" sortexpression= "CKDH"/> <asp:boundfield "datafield=" ckkb = "Out of the Library" sortexpression= "ckkb"/> <asp:boundfield datafield= "ypqx" headertext= "Drug whereabouts" Sortexpression= "Ypqx"/> <asp:boundfield datafield= "YPBH" headertext= "drug number" sortexpression= "YPBH"/> <asp:boundfield datafield= "YPMC" headertext= "Drug name" sortexpression= "YPMC"/> <asp: BoundField datafield= "GG" headertext= "Pharmaceutical Specifications" sortexpression= "GG"/> <asp:boundfield "DW" headertext= "Drug unit" sortexpression= "DW"/> <asp:boundfield datafield= "sj" headertext= "out of the library price" Sortexpre
           ssion= "SJ"/> <asp:boundfield datafield= "SL" headertext= "number of out of stock" sortexpression= "SL"/>
           </Columns> <selectedrowstyle forecolor= "Navy" backcolor= "#FFCC66" font-bold= "True"/> <rowstyle forecolor= "#333333" backcolor= "#FFFBD6"/> <footerstyle backcolor= "#990000" font-bold= "Tru
           E "forecolor="/>  
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C # Background code:
 
protected void Gridview1_selectedindexchanging (object sender, GridViewSelectEventArgs a) {TextBox1.Text = Gr Idview1.rows[a.newselectedindex]. CELLS[1].
        Text.tostring (); TextBox2.Text = Gridview1.rows[a.newselectedindex]. CELLS[2].
        Text.tostring (); TextBox3.Text = Gridview1.rows[a.newselectedindex]. CELLS[3].
        Text.tostring (); Textbox4.text = Gridview1.rows[a.newselectedindex]. CELLS[4].
        Text.tostring (); Textbox5.text = Gridview1.rows[a.newselectedindex]. CELLS[5].
        Text.tostring (); Textbox6.text = Gridview1.rows[a.newselectedindex]. CELLS[6].
        Text.tostring (); Textbox7.text = Gridview1.rows[a.newselectedindex]. CELLS[7].
        Text.tostring (); Textbox8.text = Gridview1.rows[a.newselectedindex]. CELLS[8].
        Text.tostring (); Textbox9.text = Gridview1.rows[a.newselectedindex]. CELLS[9].
        Text.tostring ();
        session["Shuliang"] = Convert.ToInt32 (Textbox9.text); Textbox10.text = Gridview1.rows[e.newselectedindex]. CELLS[10]. Text.
        ToString (); Textbox11.text = Gridview1.rows[e.newselectedindex]. CELLS[11].
        Text.tostring (); TextBox1.Text = Gridview1.rows[e.newselectedindex]. CELLS[1].
        Text.tostring ();
    
        Response.Write ("