Make Visual Studio to add .dll to GAC after each build

Go to Project > Properties and enter the following into the Post-build event command line:
(on Windows Server 2012)
"C:\Program Files (x86)\Microsoft SDKs\Windows\v8.0A\bin\NETFX 4.0 Tools\gacutil.exe" /i
"$(TargetPath)" /f
(on Windows Server 2008)
"C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\bin\gacutil.exe" /i "$(TargetPath)" /f

Remember to:

• run Visual Studio as Administrator
• sign the assembly

Replace columns in DataTable and by the way insert at specified position (code snippet)

DataTable table = GetSomeDataTable();

table.Columns.Add("NewNumber", typeof(int)).SetOrdinal(table.Columns["OldColumn1"].Ordinal);

table.Columns.Add("NewText", typeof(string)).SetOrdinal(table.Columns["OldColumn2"].Ordinal);

foreach (DataRow row in table.Rows)

{

  row["NewNumber"] = Transform1(row["OldColumn1"]);

  row["NewText"] = Transform2(row["OldColumn2"]);

}

table.Columns.Remove("OldColumn1");
table.Columns.Remove("OldColumn2");