Updated datatable general search string filter to be case insensitive

Author: Sauedy

Mvc.JQuery.DataTables.Common/Processing/TypeFilters.cs

@@ -227,14 +227,14 @@ public static string StringFilter(string q, string columnname, DataTablesPropert
                 {
                     parametersforlinqquery.Add(q.Substring(1, q.Length - 2));
                     var parameterArg = "@" + (parametersforlinqquery.Count - 1);
-                    return string.Format("{0} ==  {1}", columnname, parameterArg);
+                    return string.Format("{0}.ToLower() ==  {1}.ToLower()", columnname, parameterArg);
 
                 }
                 else
                 {
                     parametersforlinqquery.Add(q.Substring(1));
                     var parameterArg = "@" + (parametersforlinqquery.Count - 1);
-                    return string.Format("({0} != null && {0} != \"\" && ({0} ==  {1} || {0}.StartsWith({1})))", columnname, parameterArg);
+                    return string.Format("({0} != null && {0} != \"\" && ({0}.ToLower() ==  {1}.ToLower() || {0}.ToLower().StartsWith({1}.ToLower())))", columnname, parameterArg);
                 }
             }
             else
@@ -244,7 +244,7 @@ public static string StringFilter(string q, string columnname, DataTablesPropert
                 //return string.Format("{0} ==  {1}", columnname, parameterArg);
                 return
                     string.Format(
-                        "({0} != null && {0} != \"\" && ({0} ==  {1} || {0}.StartsWith({1}) || {0}.Contains({1})))",
+                        "({0} != null && {0} != \"\" && ({0}.ToLower() ==  {1}.ToLower() || {0}.ToLower().StartsWith({1}.ToLower()) || {0}.ToLower().Contains({1}.ToLower())))",
                         columnname, parameterArg);
             }
         }