title: To check if var is String type
body: <p>I have a problem in code in C#:</p>
  
  <p>I don't know how to implement logic - iterating through Hashtable
  having values of different data types, the schema I want is below:</p>
  
  <pre><code>if the value in variable is String type
  {
   do action1;
  }
  else 
  {
    do action2;
  }
  </code></pre>
  
  <hr>
  
  <p>There is a hashtable containing data of Types - String and Int (combined):</p>
  
  <pre><code>public string SQLCondGenerator {
  
          get
          {
  
              Hashtable conditions = new Hashtable();
  
              //data having String data type
              conditions.Add("miap", ViewState["miap_txt"]);
              conditions.Add("pocode", ViewState["po_txt "]);
              conditions.Add("materialdescription", ViewState["mat_desc_txt"]);
              conditions.Add("suppliername", ViewState["supplier_txt"]);
              conditions.Add("manufacturername", ViewState["manufacturer_txt"]);
  
              //data having Int32 data type
              conditions.Add("spareparts", ViewState["sp_id"]); 
              conditions.Add("firstfills", ViewState["ff_id"]);
              conditions.Add("specialtools", ViewState["st_id"]);
              conditions.Add("ps_deleted", ViewState["ps_del_id"]);
              conditions.Add("po_manuallyinserted", ViewState["man_ins_id"]);
  
              String SQLCondString = "";
              String SQLCondStringConverted = "";
  
  
              string s = string.Empty;
              foreach (string name in conditions.Keys) 
              {
                  if (conditions[name] != null)
                  {
                      SQLCondString += name+ "=" +conditions[name]+ " and ";
                      Response.Write(conditions[name].GetType());
  
                      bool valtype = conditions[name].GetType().IsValueType;
                      if (valtype == string)
                      {
                        SQLCondString.Substring(0, SQLCondString.Length - 4);
                        SQLCondString += name + " and like '%" + conditions[name] + "%' and ";
                      }
                  }
              }
  
          //Response.Write("********************");
           SQLCondStringConverted = SQLCondString.Substring(0, SQLCondString.Length - 4);
           return SQLCondStringConverted;
          }   
      }
  </code></pre>
  
  <p>May be I am wrong in coding, please advise!</p>
  
  <p>Thanks!</p>