How to select grid value

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protected void CovidSelfDecleartionDeatils_RowCommand(object sender, GridViewCommandEventArgs e)
      {
          try
          {

              if (e.CommandArgument != "")
              {
                  int Index = Convert.ToInt32(e.CommandArgument);
               if (e.CommandName=="Select")
              {
                  GridViewRow clickedRow = CovidSelfDecleartionDeatils.Rows[Index];
                  Session["Filepath"] = clickedRow.Cells[9].Text;
                  //Session["Filepath"] = CovidSelfDecleartionDeatils.Rows[Index].FindControl("FilePath");
                  Session["Filepath1"] = CovidSelfDecleartionDeatils.DataKeys[Index]["Filepath"].ToString();
                  string filepath = Session["Filepath"].ToString();
              }
              }

          }
          catch
          {

          }
      }

What I have tried:

Whats is error in this code why showing excetion

Object reference not set to an instance of an object. in this column showing value

Posted 31-Mar-21 23:49pm

Member 12700993

Updated 1-Apr-21 0:24am

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Member 12700993 1-Apr-21 6:37am

I am getting value in the index but my column is visible=false

1 solution

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Richard MacCutchan · Answer 1 · 2021-04-01T00:24:00

The message tells you that you are using a reference that has not been initialise to an object. So look at the line that the error occurs on to find out why.

Also do not use Convert.ToInt32 as it will fail if the string contains invalid characgters. Use Int32.TryParse Method (System) | Microsoft Docs[^] so you can catch errors.

And never write

C#

catch
{

}

that is just a waste of typing. The whole reason for using try/catch is to capture problems in your code and take action to either resolve them (if possible) or report them to the user.