Conversion failed when converting from a character string to uniqueidentifier.

Server Error in '/' Application.

Conversion failed when converting from a character string to uniqueidentifier.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Data.SqlClient.SqlException: Conversion failed when converting from a character string to uniqueidentifier.

Source Error:

Line 34:                         using (reader = command.ExecuteReader())
Line 35:                         {
Line 36:                             if (reader.Read())
Line 37:                             {
Line 38:                                 ToEmail = reader["ToEmail"].ToString();

Source File: D:\IISROOT\virtualbench\messageReply.aspx.cs    Line: 36

Stack Trace:

[SqlException (0x80131904): Conversion failed when converting from a character string to uniqueidentifier.]
   System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +3318656
   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) +334
   System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) +4289
   System.Data.SqlClient.SqlDataReader.TryHasMoreRows(Boolean& moreRows) +255
   System.Data.SqlClient.SqlDataReader.TryReadInternal(Boolean setTimeout, Boolean& more) +298
   System.Data.SqlClient.SqlDataReader.Read() +43
   VirtualBenchChat.MessageReply.Page_Load(Object sender, EventArgs e) in D:\IISROOT\virtualbench\messageReply.aspx.cs:36
   System.Web.UI.Control.OnLoad(EventArgs e) +108
   System.Web.UI.Control.LoadRecursive() +90
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1607


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4075.0
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