Gridview OnRowUpdating event get the value of label and textbox - ASP.NET

aspx page code

<asp:GridView ID="GridViewAdmin_Users" runat="server" DataKeyNames="OldPassword, OldSalt">




aspx.cs page code

 string orginial_password = GridViewAdmin_Users.DataKeys[e.RowIndex].Values[0];

string original_salt = GridViewAdmin_Users.DataKeys[e.RowIndex].Values[1];

 var tpRemarks = grd_Invoice.Rows[e.RowIndex].FindControl("txtTPRemarks") as TextBox;

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reference:- https://stackoverflow.com/questions/43634813/get-old-value-of-label-inside-gridview-during-rowupdating-asp-net-gridview-c-s