String Contains Example

 In this Asp .Net Tutorial we will learn who to use String.Contains method. String.Contains method is used to check whether a substring/text occurs within string or not.  This method uses case sensitive and culture-insensitive comparison to check substring with in a string. This method returns true if the substring is present in the string and returns false if the substring is not present in the string. 
 

This method is very usefull when you want to check wether the substring/text is present within the string or not. If you want to compare two strings you can use String.CompareTo method.

HTML Source

  

            

                

                    Actual String
                    
                
            
            

                

                    
                
            
            

                

                    
                
            
            

                

                    Result
                    
                
            
        

Code Behind

 protected void btnCheckValue_Click(object sender, EventArgs e)
    {
        string s1 = lblString.Text;
        bool result = s1.Contains(txtStringToCheck.Text.Trim());
        lblResult.Text = result.ToString();
    }

Final Output

In th above example you can see if I search substring with the same case then String.Contains method returns true and if I search substring with uppercase it returns false. This is because String.Contains Method is case sensitive.