如何通过SQL查询返回字符串值？

Question

I have a query which retuns a string value as the output. But shows an error in the return. I dont know how to fix it. Here i have added my query.

public string detailsRemarksGet(string ddlValue)
{

     string strQuery = @"select r.remarks
                        from [A_MASTER] m, [A_REMARKS] r
                        where m.A_REF_NO=r.A_REF_NO 
                        and r.A_REF_NO='"+ ddlValue +"' and DEPT='POS' ";
     return SqlHelper.ExecuteScalar(strConnStringAppeal, CommandType.Text, strQuery);
}

Here is mky code of .cs

public string detailsRemarks(string ddlValue)
{
   string remarks= db.detailsRemarksGet(ddlValue);
   return remarks;
}

In the error list i get a message as follows

Error 2 Cannot implicitly convert type 'object' to 'string'. An explicit conversion exists (are you missing a cast?)

Answer 1

Sql query return object type, you need to cast that as string . So cast as string using ToString() method in return statement

return SqlHelper.ExecuteScalar(strConnStringAppeal, CommandType.Text, strQuery).ToString();

Answer 2

Just convert your return type to String , because your method name db.detailsRemarksGet will return you an object and your detailsRemarks method return type is string.

public string detailsRemarks(string ddlValue)
{
    string remarks= Convert.ToString(db.detailsRemarksGet(ddlValue));
    return remarks;
}