conversion problem in asp.net 2005

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ASP.NET

Hello Sir,

if (e.CommandName == "insertrecord")
        {
            string firstname = ((TextBox)(GridView1.FooterRow.FindControl("txtfirstname")).Text??string.Empty);
            string lastname = ((TextBox)(GridView1.FooterRow.FindControl("txtlastname")).Text??string.Empty);
            string nickname = ((TextBox)(GridView1.FooterRow.FindControl("txtnickname")).Text??string.Empty);
            string salary = ((TextBox)(GridView1.FooterRow.FindControl("salary")).Text??string.Empty);

SIR I FACE SAME ERROR AND SIR ERROR LIKE THIS :-

Error   1   'System.Web.UI.Control' does not contain a definition for 'Text'    C:\Documents and Settings\Harry\My Documents\Visual Studio 2005\example6\Default.aspx.cs    45  92  C:\...\example6\

SIR PLS I CANT EXECUTE THIS CODE PLS SEND ME GOOD SOLUTION FOR THIS..WHICH I CAN EXECUTE VERY WELL

THANK YOU
SIR

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
   {
       if (e.CommandName == "insertrecord")
       {
           string firstname = (GridView1.FooterRow.FindControl("txtfirstname")).ToString() as TextBox;
           string lastname = (GridView1.FooterRow.FindControl("txtlastname")).ToString() as TextBox;
           string nickname = (GridView1.FooterRow.FindControl("txtnickname")).ToString() as TextBox;
           string salary = (GridView1.FooterRow.FindControl("salary")).ToString() as TextBox;
 
           SqlCommand comm = new SqlCommand();
           comm.CommandText = "insert into tbluser (firstname,lastname,nickname,salary) values(@firstname,@lastname,@nickname,@salary)";
           comm.Connection = conn;
 
           comm.Parameters.AddWithValue("@firstname", firstname.ToString());
           comm.Parameters.AddWithValue("@lastname", lastname.ToString());
           comm.Parameters.AddWithValue("@nickname", nickname.ToString());
           comm.Parameters.AddWithValue("@salary", salary.ToString());
 
           conn.Open();
           comm.ExecuteNonQuery();
           conn.Close();
 
           LoadGridView();
 
       }

When I execute the code I get the error:
Collapse | Copy Code
1 Cannot convert type 'string' to 'System.Web.UI.WebControls.TextBox' via a built-in conversion C:\Documents and Settings\Harry\My Documents\Visual Studio 2005\example6\Default.aspx.cs 45 32 C:\...\example6\
Please help me solve the problem.

Thank you.