how to read the values of the clicked buttons tow? - asp.net

Question

I have a grid-view and in one column, I added buttons with every row that it is creating a button. What I need now is, if someone clicks on that button I need to get the field of that corresponding row. I have searched for the solution but i can't find out how to do it ?
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<asp:GridView ID="GridView1" runat="server" AllowPaging="True" AllowSorting="True" AutoGenerateColumns="False" DataKeyNames="Id" DataSourceID="SqlDataSource1" OnSelectedIndexChanged="GridView1_SelectedIndexChanged">
<Columns>
<asp:CommandField ShowEditButton="True" ShowSelectButton="True" />
<asp:BoundField DataField="brandname" HeaderText="brandname" SortExpression="brandname" />
<asp:BoundField DataField="info" HeaderText="info" SortExpression="info" />
<asp:ButtonField DataTextField="brandname" HeaderText="brandname" ButtonType="Button"/>
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConflictDetection="CompareAllValues" ConnectionString="<%$ ConnectionStrings:DefaultConnection %>" DeleteCommand="DELETE FROM [brand_tbl] WHERE [Id] = #original_Id AND (([brandname] = #original_brandname) OR ([brandname] IS NULL AND #original_brandname IS NULL)) AND (([info] = #original_info) OR ([info] IS NULL AND #original_info IS NULL))" InsertCommand="INSERT INTO [brand_tbl] ([brandname], [info]) VALUES (#brandname, #info)" OldValuesParameterFormatString="original_{0}" SelectCommand="SELECT * FROM [brand_tbl]" UpdateCommand="UPDATE [brand_tbl] SET [brandname] = #brandname, [info] = #info WHERE [Id] = #original_Id AND (([brandname] = #original_brandname) OR ([brandname] IS NULL AND #original_brandname IS NULL)) AND (([info] = #original_info) OR ([info] IS NULL AND #original_info IS NULL))">
<DeleteParameters>
<asp:Parameter Name="original_Id" Type="Int32" />
<asp:Parameter Name="original_brandname" Type="String" />
<asp:Parameter Name="original_info" Type="String" />
</DeleteParameters>
<InsertParameters>
<asp:Parameter Name="brandname" Type="String" />
<asp:Parameter Name="info" Type="String" />
</InsertParameters>
<UpdateParameters>
<asp:Parameter Name="brandname" Type="String" />
<asp:Parameter Name="info" Type="String" />
<asp:Parameter Name="original_Id" Type="Int32" />
<asp:Parameter Name="original_brandname" Type="String" />
<asp:Parameter Name="original_info" Type="String" />
</UpdateParameters>
</asp:SqlDataSource>
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Answer 1

protected void gView_RowDataBound(object sender, GridViewRowEventArgs e)
{
DataRowView rowView= (DataRowView)e.Row.DataItem;
if (rowView["ColumnId"] != DBNull.Value)
{
var val =rowView["ColumnId"];
}
}
// you can also do like this
void GridView_RowCommand(Object sender, GridViewCommandEventArgs e)
{
//Check if it's the right CommandName...
if(e.CommandName=="Add")
{
// do code
}
}

Answer 2

you can define DataKeyNames on GridView, follow this:
DataKeyNames in GridView