In gridview how to use rowcommand event for a button

Question

I am using a gridview in aspx and i have two pages that registration and details.aspx once registration completed it should goto details page in details.aspx i have kept a g

Answer 1

First your button control CommandArgument property must have a unique value in each row:

 <asp:Button ID="btnedit" runat="server" Text="Edit" CommandName="Edit" 
             CommandArgument="<%# ((GridViewRow) Container).RowIndex %>" />

Then on your code behind GridView3_RowCommand event you will have something like the code below:

protected void GridView3_RowCommand(object sender, GridViewCommandEventArgs e)
{
    int index = 0;
    GridViewRow row;
    GridView grid = sender as GridView;

    switch (e.CommandName)
    {
        case "Edit":
            index = Convert.ToInt32(e.CommandArgument);
            row = grid.Rows[index];

            //use row to find the selected controls you need for edit, update, delete here
            // e.g. HiddenField value = row.FindControl("hiddenVal") as HiddenField;

            break;
    }
}

Answer 2

Two methods To do this

Method 1

Please change these things in markup

1. Change CommandName="EditUserName"
2. Omit the CommandArgument. We don't need this

Code-behind

protected void GridView3_RowCommand(object sender, GridViewCommandEventArgs e)
{
    if (e.CommandName == "EditUserName")
    {
        //first find the button that got clicked
        var clickedButton = e.CommandSource as Button;
        //find the row of the button
        var clickedRow = clickedButton.NamingContainer as GridViewRow;
        //now as the UserName is in the BoundField, access it using the cell index.
        var clickedUserName = clickedRow.Cells[0].Text;
    }
}

Method 2

Give a CommandArgument. You can give many different arguments like these

1. CommandArgument="<%# Container.DataItemIndex %>"
2. CommandArgument="<%# Container.DisplayIndex %>"
3. CommandArgument="<%# ((GridViewRow) Container).RowIndex %>" (the one Ali gave)

Now in code, do this

protected void GridView3_RowCommand(object sender, GridViewCommandEventArgs e)
{
    if (e.CommandName == "EditUserName")
    {            
        var clickedUserName = CustomersTable
            .Rows[Convert.ToInt32(e.CommandArgument)]//find the row with the clicked index
            .Cells[0]//find the index of the UserName cell
            .Text;//grab the text
    }
}

P.S:

1.The reason for changing the CommandName is that if the CommandName="Edit", it will fire the RowEditing event which will give you this error

The GridView 'GridView3' fired event RowEditing which wasn't handled.

2.Place the Page_Load code inside if(!IsPostBack) or else none the above methods work.