In this article I will explain with an example, how to get value of DataKeyNames (DataKeys) in RowCommand and RowDataBound events of ASP.Net GridView using C# and VB.Net.
 
 

HTML Markup

The following HTML Markup consists of:
GridView - For displaying records.
The GridView consists of two BoundField columns and one ButtonField column.
 

Properties

DataKeyNames – For storing the Unique key values such as Primary Key, ID fields, etc.
Note: For more details on DataKeys, please refer my article DataKeyNames in GridView example in ASP.Net.
 
Here, DataKeyNames property is set with multiple values i.e. Id and Group.
 

Events

GridView has been assigned with the following event handler i.e. OnRowDataBound, OnRowCommand.
<asp:GridView ID="gvCustomers" runat="server" AutoGenerateColumns="false" DataKeyNames="Id, Group"
    OnRowDataBound="GridView1_RowDataBound" OnRowCommand="GridView1_RowCommand">
    <Columns>
        <asp:BoundField DataField="Name" HeaderText="Name" ItemStyle-Width="150" />
        <asp:BoundField DataField="Country" HeaderText="Country" ItemStyle-Width="100" />
        <asp:ButtonField CommandName="Select" Text="Get Value" ButtonType="Button" />
    </Columns>
</asp:GridView>
 
 

Namespaces

You will need to import the following namespace.
C#
using System.Data;
 
VB.Net
Imports System.Data
 
 

Binding the GridView

Inside the Page Load event handler, the GridView is populated with data by making use of a Dynamic DataTable with some records.
Note: For more details on how to use Dynamic DataTable, please refer my article Dynamically create DataTable and bind to GridView in ASP.Net.
 
C#
protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[4] {
                            new DataColumn("Id"),
                            new DataColumn("Group"),
                            new DataColumn("Name"),
                            new DataColumn("Country") });
        dt.Rows.Add(1, "A", "John Hammond", "United States");
        dt.Rows.Add(2, "B", "Mudassar Khan", "India");
        dt.Rows.Add(3, "A", "Suzanne Mathews", "France");
        dt.Rows.Add(4, "B", "Robert Schidner", "Russia");
        gvCustomers.DataSource = dt;
        gvCustomers.DataBind();
    }
}
 
VB.Net
Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Dim dt As New DataTable()
        dt.Columns.AddRange(New DataColumn(3) {
                            New DataColumn("Id"),
                            New DataColumn("Group"),
                            New DataColumn("Name"),
                            New DataColumn("Country")})
        dt.Rows.Add(1, "A", "John Hammond", "United States")
        dt.Rows.Add(2, "B", "Mudassar Khan", "India")
        dt.Rows.Add(3, "A", "Suzanne Mathews", "France")
        dt.Rows.Add(4, "B", "Robert Schidner", "Russia")
        gvCustomers.DataSource = dt
        gvCustomers.DataBind()
    End If
End Sub
 
 

Getting the values of multiple DataKeys inside RowDataBound Event

Inside the RowDataBound event handler, the Row Index is determined.
Next, using the Row Index, the DataKeys array is accessed and the value of the Id field is referenced from 0th index, while the value of the Group field is referenced from the 1st index.
C#
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        //Get the value of column from the DataKeys using the RowIndex.
        int id = Convert.ToInt32(gvCustomers.DataKeys[e.Row.RowIndex].Values[0]);
        string group = gvCustomers.DataKeys[e.Row.RowIndex].Values[1].ToString();
    }
}
 
VB.Net
Protected Sub GridView1_RowDataBound(sender As Object, e As GridViewRowEventArgs)
    If e.Row.RowType = DataControlRowType.DataRow Then
        'Get the value of column from the DataKeys using the RowIndex.
        Dim id As Integer = Convert.ToInt32(gvCustomers.DataKeys(e.Row.RowIndex).Values(0))
        Dim group As String = gvCustomers.DataKeys(e.Row.RowIndex).Values(1).ToString()
    End If
End Sub
 
 

Getting the values of multiple DataKeys inside RowCommand Event

When Select Button is clicked, the Row Index is determined using the CommandArgument property of GridViewCommandEventArgs class object.
Then, using the Row Index, the DataKeys array is accessed and the value of the Id field is referenced from 0th index, while the value of the Group field is referenced from the 1st index.
Finally, the values are displayed using JavaScript Alert Message Box.
C#
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
    //Determine the RowIndex of the Row whose Button was clicked.
    int rowIndex = Convert.ToInt32(e.CommandArgument);
 
    //Get the value of column from the DataKeys using the RowIndex.
    int id = Convert.ToInt32(gvCustomers.DataKeys[rowIndex].Values[0]);
    string group = gvCustomers.DataKeys[rowIndex].Values[1].ToString();
 
    ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('Id: " + id + "\\nGroup: " + group + "');", true);
}
 
VB.Net
Protected Sub GridView1_RowCommand(sender As Object, e As GridViewCommandEventArgs)
    'Determine the RowIndex of the Row whose Button was clicked.
    Dim rowIndex As Integer = Convert.ToInt32(e.CommandArgument)
 
    'Get the value of column from the DataKeys using the RowIndex.
    Dim id As Integer = Convert.ToInt32(gvCustomers.DataKeys(rowIndex).Values(0))
    Dim group As String = gvCustomers.DataKeys(rowIndex).Values(1).ToString()
 
    ClientScript.RegisterStartupScript(Me.GetType(), "alert", "alert('Id: " & id & "\nGroup: " & group & "');", True)
End Sub
 
 

Screenshots

Getting the values of multiple DataKeys inside RowDataBound event

Get value of DataKeyNames (DataKeys) in RowCommand and RowDataBound events of ASP.Net GridView
 

Getting the values of multiple DataKeys inside RowCommand event

Get value of DataKeyNames (DataKeys) in RowCommand and RowDataBound events of ASP.Net GridView
 
 

The Form

Get value of DataKeyNames (DataKeys) in RowCommand and RowDataBound events of ASP.Net GridView
 
 

Demo

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Downloads

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