String.Format method

public static class SqlCommandExt

{

public static SqlParameter[] AddArrayParameters(this SqlCommand cmd, IEnumerable values, string paramNameRoot, int start = 1, string separator = ", ")

{

var parameters = new List();

var parameterNames = new List();

var paramNbr = start;

foreach (var value in values)

{

var paramName = string.Format("@{0}{1}", paramNameRoot, paramNbr++);

parameterNames.Add(paramName);

parameters.Add(cmd.Parameters.AddWithValue(paramName, value));

}

cmd.CommandText = cmd.CommandText.Replace("{" + paramNameRoot + "}", string.Join(separator, parameterNames));

return parameters.ToArray();

}

}

Module StringExtensions

Public Function AddArrayParameters(Of T)(ByVal cmd As SqlCommand, ByVal values As IEnumerable(Of T), ByVal paramNameRoot As String, Optional ByVal start As Integer = 1, Optional ByVal separator As String = ", ") As SqlParameter()

Dim parameters = New List(Of SqlParameter)

Dim parameterNames = New List(Of String)

Dim paramNbr As Integer = start

For Each value In values

Dim paramName = String.Format("@{0}{1}", paramNameRoot, paramNbr + +)

parameterNames.Add(paramName)

parameters.Add(cmd.Parameters.AddWithValue(paramName, value))

Next

cmd.CommandText = cmd.CommandText.Replace(("{" + (paramNameRoot + "}")), String.Join(separator, parameterNames))

Return parameters.ToArray

End Function

End Module

But the line Dim paramName = String.Format("@{0}{1}", paramNameRoot, paramNbr + +)

says expression expected. I think "paramNbr + +" is causing the problem.

Please help me