how to get value of a hidden column of gridview in C#

[denvercr]

Hi

how do i possibly get the value of a hidden column (id) of a gridview binded in sqldatasource? i have this code in C# usng GridViewRow and DataKey Classes to retrieve it, I also set the DataKeyNames to "id".. here is the code:

GridViewRow gridViewRow;
DataKey dataKey;

gridViewRow = GridView.Select edRow;
dataKey = GridView.DataKe ys[gridViewRow.Row Index];
Label1.text = Convert.ToStrin g(dataKey.Value ); // This should display id value.

Once i fire this up, an exception occured: "Object reference not set to an instance of an object".

The code works fine in VB but in C# it doesnt. Please help me out.. Thank you so much.

[aaronsandoval]

I know this may have been posted a while back, but here is the answer for future readers who may be searching for this answer:

GridViewRow DataKeyName Value

IMPORTANT: Make sure you have set the DataKeyNames value equal to the ID your trying to find (example: EmployeeID from a database table with a list of Employee Information)

Scenarios:

1.Scenario)
If you have a GridView control and set OnRowEditing="m yGridView_RowEd iting"

1.Answer)
[code=cpp]
public void myGridView_RowE diting(Object sender, GridViewEditEve ntArgs e)
{
myGridView.Edit Index = e.NewEditIndex;
DataKey dk = myGridView.Data Keys[e.NewEditIndex];
int myDataKeyID = (int)dk.Values["MyDataKeyI D"];

Label1.Text = myDataKeyID.ToS tring();
}
[/code]
2.Scenario)
If you enstantiate the call through GridView TemplateField Column that has an ImageButton with an OnClick="btnEdi tGridData_Click " method

2.Answer)
[code=cpp]
protected void btnEditGridData _Click(object sender, EventArgs e)
{
ImageButton btnEditGridData = sender as ImageButton;
GridViewRow row = (GridViewRow)bt nEditGridData.N amingContainer;
int rowIndex = row.RowIndex;
DataKey dk = myGridView.Data Keys[rowIndex];
int value = Convert.ToInt32 (dk.Value);

Label1.Text = value.ToString( );
}[/code]

[Plater]

There should be no difference in accessing hidden vs non-hidden columns in a gridview.
What you need to remember to check is if .SelectedRow ==null, and other checks FIRST

[Frinavale]

I know this may have been posted a while back, but here is the answer for future readers who may be searching for this answer:

GridViewRow DataKeyName Value

IMPORTANT: Make sure you have set the DataKeyNames value equal to the ID your trying to find (example: EmployeeID from a database table with a list of Employee Information)

Wow thanks for the detailed reply!