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public class SqlTruncationExceptionWithDetails : ArgumentOutOfRangeException
{
    public SqlTruncationExceptionWithDetails(System.Data.SqlClient.SqlException inner, DataContext context)
        : base(inner.Message + " " + GetSqlTruncationExceptionWithDetailsString(context))
    {
    }

    /// <summary>
    /// PArt of code from following link
    /// http://stackoverflow.com/questions/3666954/string-or-binary-data-would-be-truncated-linq-exception-cant-find-which-fiel
    /// </summary>
    /// <param name="context"></param>
    /// <returns></returns>
    static string GetSqlTruncationExceptionWithDetailsString(DataContext context)
    {
        StringBuilder sb = new StringBuilder();

        foreach (object update in context.GetChangeSet().Updates)
        {
            FindLongStrings(update, sb);
        }

        foreach (object insert in context.GetChangeSet().Inserts)
        {
            FindLongStrings(insert, sb);
        }
        return sb.ToString();
    }

    public static void FindLongStrings(object testObject, StringBuilder sb)
    {
        foreach (var propInfo in testObject.GetType().GetProperties())
        {
            foreach (System.Data.Linq.Mapping.ColumnAttribute attribute in propInfo.GetCustomAttributes(typeof(System.Data.Linq.Mapping.ColumnAttribute), true))
            {
                if (attribute.DbType.ToLower().Contains("varchar"))
                {
                    string dbType = attribute.DbType.ToLower();
                    int numberStartIndex = dbType.IndexOf("varchar(") + 8;
                    int numberEndIndex = dbType.IndexOf(")", numberStartIndex);
                    string lengthString = dbType.Substring(numberStartIndex, (numberEndIndex - numberStartIndex));
                    int maxLength = 0;
                    int.TryParse(lengthString, out maxLength);

                    string currentValue = (string)propInfo.GetValue(testObject, null);

                    if (!string.IsNullOrEmpty(currentValue) && maxLength != 0 && currentValue.Length > maxLength)
                    {
                        //string is too long
                        sb.AppendLine(testObject.GetType().Name + "." + propInfo.Name + " " + currentValue + " Max: " + maxLength);
                    }

                }
            }
        }
    }
}

public static class DataContextExtensions
{
    public static void SubmitChangesWithDetailException(this DataContext dataContext)
    {
        //http://stackoverflow.com/questions/3666954/string-or-binary-data-would-be-truncated-linq-exception-cant-find-which-fiel
        try
        {
            //this can failed on data truncation
            dataContext.SubmitChanges();
        }       
        catch (SqlException sqlException) //when (sqlException.Message == "String or binary data would be truncated.")
        {

            if (sqlException.Message == "String or binary data would be truncated.") //only for EN windows - if you are running different window language, invoke the sqlException.getMessage on thread with EN culture
                throw new SqlTruncationExceptionWithDetails(sqlException, dataContext);
            else
                throw;
        }
    }
}

protected void Application_Error(object sender, EventArgs e)
{
    Exception ex = Server.GetLastError();
    string message = ex.Message;
    //TODO - log to file
}

Datamodel.SubmitChangesWithDetailException();

public class SqlTruncationExceptionWithDetails : ArgumentOutOfRangeException
{
    public SqlTruncationExceptionWithDetails(System.Data.SqlClient.SqlException inner, DataContext context)
        : base(inner.Message + " " + GetSqlTruncationExceptionWithDetailsString(context))
    {
    }

    /// <summary>
    /// PArt of code from following link
    /// http://stackoverflow.com/questions/3666954/string-or-binary-data-would-be-truncated-linq-exception-cant-find-which-fiel
    /// </summary>
    /// <param name="context"></param>
    /// <returns></returns>
    static string GetSqlTruncationExceptionWithDetailsString(DataContext context)
    {
        StringBuilder sb = new StringBuilder();

        foreach (object update in context.GetChangeSet().Updates)
        {
            FindLongStrings(update, sb);
        }

        foreach (object insert in context.GetChangeSet().Inserts)
        {
            FindLongStrings(insert, sb);
        }
        return sb.ToString();
    }

    public static void FindLongStrings(object testObject, StringBuilder sb)
    {
        foreach (var propInfo in testObject.GetType().GetProperties())
        {
            foreach (System.Data.Linq.Mapping.ColumnAttribute attribute in propInfo.GetCustomAttributes(typeof(System.Data.Linq.Mapping.ColumnAttribute), true))
            {
                if (attribute.DbType.ToLower().Contains("varchar"))
                {
                    string dbType = attribute.DbType.ToLower();
                    int numberStartIndex = dbType.IndexOf("varchar(") + 8;
                    int numberEndIndex = dbType.IndexOf(")", numberStartIndex);
                    string lengthString = dbType.Substring(numberStartIndex, (numberEndIndex - numberStartIndex));
                    int maxLength = 0;
                    int.TryParse(lengthString, out maxLength);

                    string currentValue = (string)propInfo.GetValue(testObject, null);

                    if (!string.IsNullOrEmpty(currentValue) && maxLength != 0 && currentValue.Length > maxLength)
                    {
                        //string is too long
                        sb.AppendLine(testObject.GetType().Name + "." + propInfo.Name + " " + currentValue + " Max: " + maxLength);
                    }

                }
            }
        }
    }
}

public static class DataContextExtensions
{
    public static void SubmitChangesWithDetailException(this DataContext dataContext)
    {
        //http://stackoverflow.com/questions/3666954/string-or-binary-data-would-be-truncated-linq-exception-cant-find-which-fiel
        try
        {
            //this can failed on data truncation
            dataContext.SubmitChanges();
        }       
        catch (SqlException sqlException) //when (sqlException.Message == "String or binary data would be truncated.")
        {

            if (sqlException.Message == "String or binary data would be truncated.") //only for EN windows - if you are running different window language, invoke the sqlException.getMessage on thread with EN culture
                throw new SqlTruncationExceptionWithDetails(sqlException, dataContext);
            else
                throw;
        }
    }
}

protected void Application_Error(object sender, EventArgs e)
{
    Exception ex = Server.GetLastError();
    string message = ex.Message;
    //TODO - log to file
}

Datamodel.SubmitChangesWithDetailException();

Some of our data (big) cannot fit into your database column (small). It is not easy to find what is wrong. If you use C# and Linq2Sql, you can list the field which would be truncated:

Some of your data cannot fit into your database column (small). It is not easy to find what is wrong. If you use C# and Linq2Sql, you can list the field which would be truncated:

public static class DataContextExtensions
{
    public static void SubmitChangesWithDetailException(this DataContext dataContext)
    {
        //http://stackoverflow.com/questions/3666954/string-or-binary-data-would-be-truncated-linq-exception-cant-find-which-fiel
        try
        {
            //v logu vidim, ze zde to vyjimecne selhava
            dataContext.SubmitChanges();
        }       
        catch (SqlException sqlException) //when (sqlException.Message == "String or binary data would be truncated.")
        {

            if (sqlException.Message == "String or binary data would be truncated.") //only for EN windows - if you are running different window language, invoke the sqlException.getMessage on thread with EN culture
                throw new SqlTruncationExceptionWithDetails(sqlException, dataContext);
            else
                throw;
        }
    }
}

public static class DataContextExtensions
{
    public static void SubmitChangesWithDetailException(this DataContext dataContext)
    {
        //http://stackoverflow.com/questions/3666954/string-or-binary-data-would-be-truncated-linq-exception-cant-find-which-fiel
        try
        {
            //this can failed on data truncation
            dataContext.SubmitChanges();
        }       
        catch (SqlException sqlException) //when (sqlException.Message == "String or binary data would be truncated.")
        {

            if (sqlException.Message == "String or binary data would be truncated.") //only for EN windows - if you are running different window language, invoke the sqlException.getMessage on thread with EN culture
                throw new SqlTruncationExceptionWithDetails(sqlException, dataContext);
            else
                throw;
        }
    }
}