Cannot apply indexing with [] to an expression of type 'int'

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Hi everyone,
I have a problem with gridview as i'm new to web application and expecting a solution to the below code. It goes like this,

C#

protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
    {
        GridView row = GridView1.SelectedRow;
        txtLastName.Text = GridView1.SelectedRow.RowIndex[0].ToString();
        txtFirstName.Text = GridView1.SelectedRow.RowIndex[1].ToString();
        txtEmailAddress.Text = GridView1.SelectedRow.RowIndex[2].ToString();
        txtPhoneNumber.Text = GridView1.SelectedRow.RowIndex[3].ToString();
        txtDOB.Text = GridView1.SelectedRow.RowIndex[4].ToString();
    }

how shall i proceed. I'm getting error it reads like this Cannot apply indexing with [] to an expression of type 'int'

Thanks in advance

Posted 3-Aug-12 0:07am

Manjunatha Shankar

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Ankur^\m/ 3-Aug-12 6:27am

Which line? Also did you search Google for the error message?

Manjunatha Shankar 3-Aug-12 6:42am

Hi Ankur,
Its first line GridView row = GridView1.SelectedRow; and i'm getting error and goes like this - Cannot implicitly convert type 'System.Web.UI.WebControls.GridViewRow' to 'System.Web.UI.WebControls.GridView'

any help please
Thanks in advance

3 solutions

Solution 1

First of all use GridViewSelectEventArgs in stead of EventArgs.
Second: Object mismatch between GridView and GridViewRow:
GridView row = GridView1.SelectedRow;

then:

C#

protected void GridView1_SelectedIndexChanged(object sender, GridViewSelectEventArgs e)
{
GridViewRow row = GridView1.Rows[e.NewSelectedIndex];

// or you can do

C#

GridView1.SelectedRow = e.NewSelectedIndex;

and then not forget to set the selectedIndex to -1 if not needed anymore after this call

Posted 3-Aug-12 0:19am

Herman<T>.Instance

Solution 2

try some thing like this.

C#

protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
    {
        GridView row = GridView1.SelectedRow;
        txtLastName.Text =  GridView1.SelectedRow.Cells[0].Text.ToString();
        txtFirstName.Text =  GridView1.SelectedRow.Cells[1].Text.ToString();
        txtEmailAddress.Text =  GridView1.SelectedRow.Cells[2].Text.ToString();
        txtPhoneNumber.Text =  GridView1.SelectedRow.Cells[3].Text.ToString();
        txtDOB.Text =  GridView1.SelectedRow.Cells[4].Text.ToString();
    }

Posted 3-Aug-12 0:22am

Santhosh Kumar Jayaraman

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BobJanova · Accepted Answer · 2012-08-03T00:58:00

I'm going to provide a meta-solution here. Do you actually understand what the code you pasted is trying to do? Both compiler errors that you complain about are quite clear and shouldn't require you to post on a help website to resolve.

Learn to use the MSDN documentation for the Framework. It will tell you that GridView.SelectedRow returns something of type GridViewRow, so you need to declare GridViewRow row = GridView1.SelectedRow;. And it will tell you that to get a cell out of a GridViewRow you need to use the Cells property: txtLastName.Text = row.Cells[0].ToString().

When you get a compiler error, Google will help you find the cause. But since you didn't seem able to resolve some simple and clear ones, I think you perhaps need to introduce yourself to C# and .Net more slowly and through a structured course.

Why do you declare row and then not use it? Why look up SelectedRow every line when you just saved it into a variable?