How to convert String value to boolean in c#

Question

2.33/5 (2 votes)

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Hi, I am fetching the record from database and want to check the Whether record for perticular row is present or not? I am trying some code at below ,but error is that cannot convert bool to string...
So how can i overcome this problem

C#

bool chek = DS.Tables["table"].Rows[0]["MB_MobileNo"].ToString().Contains();
if(Chek>0)
                            {
                                txtMobileNo.Text = DS.Tables["table"].Rows[0]["MB_MobileNo"].ToString().Substring(3);
                            }

Posted 19-Feb-14 19:28pm

SVT02

Updated 27-Jun-18 7:24am

Add a Solution

9 solutions

Solution 1

Use the Boolean.Parse[^] or Boolean.TryParse[^] methods.

Posted 19-Feb-14 19:32pm

Maarten Kools

Solution 2

bool check = string.IsNullOrEmpty( Convert.ToString( ds.Tables["table"].Rows[0]["column"]));

C#

Posted 19-Feb-14 19:35pm

prakashdotnet

Comments

SVT02 20-Feb-14 1:40am

But How can i write the 'chek' for testing condition

prakashdotnet 20-Feb-14 1:42am

what exactly you want in check condition

SVT02 20-Feb-14 1:49am

if(chek)
{
......
}

prakashdotnet 20-Feb-14 2:59am

yes using
bool check = string.IsNullOrEmpty( Convert.ToString( ds.Tables["table"].Rows[0]["column"]));

you can add check condition in if
if (check)
{
// ur rest of logic
}

Solution 3

Refer This

Posted 19-Feb-14 19:35pm

King Fisher

Solution 4

try this

C#

var chek = DS.Tables["table"].Rows[0]["MB_MobileNo"].ToString().Contains();
if(Int.Parse(Chek)>0)
  {
   txtMobileNo.Text = DS.Tables["table"].Rows[0]["MB_MobileNo"].ToString().Substring(3);
  }

your trying to compare string to int that's why you get the error I guess. . .

Posted 19-Feb-14 19:40pm

The14thNoah

Updated 19-Feb-14 19:41pm

v3

Comments

SVT02 20-Feb-14 1:49am

I have tried this but error is that input string is not in correct format

Solution 5

Here you don't need to do any Type conversion.Please try is as below.

C#

if (DS.Tables["table"].Count()>0 && DS.Tables["table"].Rows[0]["MB_MobileNo"].Count()>0)

      {
       txtMobileNo.Text = DS.Tables["table"].Rows[0]["MB_MobileNo"].ToString().Substring(3);
      }

Posted 19-Feb-14 19:50pm

Sampath Lokuge

Updated 19-Feb-14 20:10pm

v3

Comments

SVT02 20-Feb-14 1:55am

It shows error like Operator '>' cannot be applied on operands of type 'method group' and 'int'

Sampath Lokuge 20-Feb-14 2:10am

I have updated the solution.Please check that.

Solution 7

Simple you can write like below...

C#

if (!string.IsNullOrEmpty(DS.Tables["table"].Rows[0]["MB_MobileNo"].ToString()))
               {
                   txtMobileNo.Text = DS.Tables["table"].Rows[0]["MB_MobileNo"].ToString().Substring(3);
               }

Posted 19-Feb-14 20:33pm

Ramug10

Solution 8

You are trying to assign a string value to bool.which never possible.
You can try ternary to check:

C#

string vString = DS.Tables["table"].Rows[0]["MB_MobileNo"].ToString().Substring(3);
string abc = vString !="" ? vString : "";

Posted 20-Feb-14 0:18am

Jubayer Ahmed

Solution 9

if (DS.Tables["table"].Rows.Count > 0 && !string.IsNullOrEmpty(DS.Tables["table"].Rows[0]["MB_MobileNo"].ToString()))
{
//do your logic
}

// Have to include the Rows.Count check to avoid possible IndexOutOfRangeException

Posted 27-Jun-18 7:25am

Member 13889705

Comments

Richard Deeming 27-Jun-18 13:32pm

As already mentioned in solution 5 - FOUR YEARS AGO.

Member 13889705 4-Nov-21 13:53pm

Solution 5 is slightly different and throws an exception. This does not.

Richard Deeming 5-Nov-21 5:20am

It took you three years to respond to this comment, and your defence is to claim that the virtually identical code you copied from throws "an exception"? You couldn't even be bothered to specify which exception you think it throws, nor explain why you think your solution wouldn't throw it.

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SVT02 · Accepted Answer · 2014-02-19T20:03:00

Solution 6

solved just tried

C#

if(DS.Tables["table"].Rows[0]["MB_MobileNo"].ToString()!="")
                            {
                                txtMobileNo.Text = DS.Tables["table"].Rows[0]["MB_MobileNo"].ToString().Substring(3);
                            }

Posted 19-Feb-14 20:03pm

SVT02