Plz...help me to find out my error

Question

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but the error displays like tat...

C++

Unable to cast object of type 'System.Web.UI.WebControls.DataControlLinkButton' to type 'System.Web.UI.WebControls.TextBox'

tis s t code

XML

<asp:GridView ID="GridView1" runat="server" AllowPaging="True" AutoGenerateColumns="False"
                        CellPadding="3" CellSpacing="2" OnPageIndexChanging="GridView1_PageIndexChanging"
                        OnRowCancelingEdit="GridView1_RowCancelingEdit" OnRowEditing="GridView1_RowEditing"
                        OnRowUpdating="GridView1_RowUpdating" PageSize="3">
                        <Columns>
                            <asp:CommandField ShowEditButton="True" />
                            <asp:BoundField DataField="name" HeaderText="Name" />
                        </Columns>
                    </asp:GridView>

C++

SqlConnection con1 = new SqlConnection(ConfigurationManager.AppSettings["rajarani connection"]);
           con1.Open();
           SqlDataAdapter adp1 = new SqlDataAdapter("update registerform set fullname='" + ((TextBox)GridView2.Rows[e.RowIndex].Cells[1].Controls[0]).Text + "' where registerform.id='"+GridView2.Rows[e.RowIndex].Cells[0].Text+"' ", con1);
           DataSet ds1 = new DataSet();
           adp1.Fill(ds1);
           con1.Close();
           GridView2.EditIndex = -1;
           bind();

plz..help me ..

Posted 5-Aug-10 1:34am

mehalanandu

Updated 5-Aug-10 20:54pm

v3

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Comments

koool.kabeer 5-Aug-10 8:25am

you are purely casting the type of "System.Web.UI.WebControls.DataControlLinkButton"
to the type of "System.Web.UI.WebControls.TextBox"..
which you cant do...
may be you are giving index of Control incorrectly..
check either the index of Cell in "..Cell[1]..."
or the index of Control in "...Cell[1].Controls[0]..."...

3 solutions

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Arun Jacob · Answer 1 · 2010-08-05T02:06:00

Solution 2

Can you try,

((LinkButton)GridView2.Rows[e.RowIndex].Cells[1].Controls[0]).Text

I hope this will work.

Posted 5-Aug-10 2:06am

Arun Jacob

Comments

mehalanandu 5-Aug-10 8:44am

thanks for gven ... i tried tis code error s not displayd but it s not updat t value

E.F. Nijboer · Answer 2 · 2010-08-05T02:04:00

Solution 1

It simply looks like your casting is incorrect

(TextBox)GridView2.Rows[e.RowIndex].Cells[1].Controls[0]).Text

Try to test the object first before casting:

if(typeof(TextBox).IsAssignableFrom(GridView2.Rows[e.RowIndex].Cells[1].Controls[0].GetType()))
{
  // ...cast value ((TextBox)GridView2.Rows[e.RowIndex].Cells[1].Controls[0]).Text;
}
;

Good luck!

Posted 5-Aug-10 2:04am

E.F. Nijboer

Comments

mehalanandu 5-Aug-10 8:47am

thanks for gven ... i tried tis code, error s not displayd but it s not updat t value

E.F. Nijboer 5-Aug-10 9:34am

Maybe your reference is simply incorrect and therefore you get the LinkButton instead of the TextBox you are looking for. Try another Cells[#] value or look in the debugger if the Controls[] array has more controls than one. If there are more you can loop through all of them and find the control you are looking for.

senguptaamlan · Answer 3 · 2010-08-05T04:29:00

Solution 3

I belive the following line is creating the error

((TextBox)GridView2.Rows[e.RowIndex].Cells[1].Controls[0]).Text

It seems that in Cells[1] you have used a LinkButton rather than a TextBox, So when you are type casting that LinkButton to TextBox the runtime is throwing the error.

If not clear, please provide the markup of the GridView control from .aspx file.

Posted 5-Aug-10 4:29am

senguptaamlan

Comments

mehalanandu 6-Aug-10 2:21am

thanks for ur idea...i need the perfect code to updat the gridview ..plz help me

senguptaamlan 6-Aug-10 2:28am

plz provide the gridview markup from the .aspx file.

mehalanandu 6-Aug-10 2:52am

Source code:
<asp:gridview id="GridView1" runat="server" allowpaging="True" autogeneratecolumns="False"
="" cellpadding="3" cellspacing="2" onpageindexchanging="GridView1_PageIndexChanging" onrowcancelingedit="GridView1_RowCancelingEdit" onrowediting="GridView1_RowEditing" onrowupdating="GridView1_RowUpdating" pagesize="3">
<columns>
<asp:commandfield showeditbutton="True">
<asp:boundfield datafield="name" headertext="Name">

mehalanandu 6-Aug-10 2:54am

I attach the code ...
refer tat..plz

senguptaamlan 6-Aug-10 3:07am

Replace the type casting with the following line of code
GridView2.Rows[e.RowIndex].Cells[1].Controls[0].Text

mehalanandu 6-Aug-10 3:33am

i replace tat but remains t sam pbm..wat i do sir sir

senguptaamlan 6-Aug-10 4:48am

R u still getting the previous error....???
Unable to cast object of type 'System.Web.UI.WebControls.DataControlLinkButton' to type 'System.Web.UI.WebControls.TextBox'