Error using MySqlParameter

[M Varghese]

I tried to execute code with parameter value, but I always get the error message
column cannot be null

<CODE >
Dim myConnection As New MySqlConnection(ConfigurationSettings.AppSettings("connectionString"))
Dim UserID As Integer
Dim sqlText As String
sqlText = "INSERT INTO test ( t2 ) VALUES ( @t2 )"
Dim myCommand As New MySqlCommand(sqlText, myConnection)
myCommand.CommandType = CommandType.Text
myCommand.Parameters.Add(New MySqlParameter("@t2", MySqlDbType.VarChar, 50, "t2")).Value = "m varghese"
myConnection.Open()
myCommand.ExecuteNonQuery()

****
I am always getting this error column cannot be null.

MySql.Data.MySqlClient.MySqlException: #23000Column 't2' cannot be null at MySql.Data.MySqlClient.Driver.ReadPacket() at MySql.Data.MySqlClient.Driver.Send(DBCmd cmd, Byte[] bytes) at MySql.Data.MySqlClient.InternalConnection.ExecuteCmd(DBCmd cmd, Byte[] buffer, Boolean consume) at MySql.Data.MySqlClient.MySqlCommand.GetNextResultSet(MySqlDataReader reader) at MySql.Data.MySqlClient.MySqlCommand.Consume() at MySql.Data.MySqlClient.MySqlCommand.ExecuteNonQuery()

M Varghese