Generating CAML at Run Time.

For that we need List<> of String type i.e List<string> strArr = new List<string>(); and one string

string entireCAMLQuery = string.Empty; .

In strArr we can Add the CAML query like

strArr.Add("<BeginsWith><FieldRef Name='CandidateName' /><Value Type='Text'>" + filter.Value + "</Value></BeginsWith>");

Then check strArr is not equal to 0.

if (strArr.Count != 0)

 {

entireCAMLQuery = BuildingCAMLUsingStringArr(strArr);

query.Query = entireCAMLQuery.ToString();

query.ViewAttributes = "Scope=\"Recursive\"";  // for fetch data from folder of  SP list.

GetItemThroughtLoop(webSite, strList, query);

}

private string BuildingCAMLUsingStringArr(List<string> strArr)

        {

            string caml = string.Empty;

            try

            {

                if (strArr.Count == 1)

                {

                    caml = strArr[0] ;

                }

                else if (strArr.Count > 1)

                {

                    int count = strArr.Count - 1;

                    caml = CAMLRecursiveCall(strArr, count) ;

                }

            }

            catch { throw; }

            finally { }

            return @"<View><Query><Where>" + caml + "</Where></Query></View>";

        }

        private string CAMLRecursiveCall(List<string> strArr,int count)

        {

            StringBuilder strBuild= new StringBuilder();

            if(count>0)

            {

                strBuild.Append("<And>");

                strBuild.Append(CAMLRecursiveCall(strArr, count-1));

                strBuild.Append(strArr[count]);

                strBuild.Append("</And>");

            }

            else

                strBuild.Append(strArr[count]);

            return strBuild.ToString();

        }

public void GetItemThroughtLoop(SPWeb webSite, string strList, SPQuery serachQuery)

{

string site = webSite.Url;

SPList List = webSite.Lists(strList);

SPListItemCollection collListItems = List.GetItems(serachQuery);

//TO DO :  Do anything with list item collection

}