input string not in correct format

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C#

--scenario--

i have two text box and drop down

TMS.API.Reimbursement.VO_Reimbursement_SC objClaimListApproval_SC = new TMS.API.Reimbursement.VO_Reimbursement_SC();
                objClaimListApproval_SC.Hub_ID = ddl_Hub.SelectedItem.Value;//drop down
                objClaimListApproval_SC.UserID = txtUserID.Text;//text box
objClaimListApproval_SC.Claim_amount = Convert.ToDecimal(txt_Claim_Amount.Text);//text box

--properties are declared in

TMS.API.Reimbursement.VO_Reimbursement_SC();

public string Hub_ID
       {
           get;
           set;
       }

public string UserID
       {
           get;
           set;
       }

public decimal Claim_amount
       {
           get;
           set;
       }

----doubt---when i debug--and reach

objClaimListApproval_SC.Claim_amount = Convert.ToDecimal(txt_Claim_Amount.Text);//text box

it goes into catch block.... i get to know that format exception was caught

Input string was not in a correct format.



---If i make the proprty string ,,,and change remove conver.todecimal i get no error

objClaimListApproval_SC.Claim_amount = txt_Claim_Amount.Text;//text box

Why this error is happening ..can we use decimal property ?


I tried this:

objClaimListApproval_SC.Claim_amount = decimal.Parse(txt_Claim_Amount.Text);

//same error

---The text box may be empty or the number that user enters[like 500 or 500.00].

--currently the above explanation is like i was not entering anything...so obviously its empty

--and i was getting input string not in proper format.

--Now question is why cannot we convert the string to decimal and store it in that objClaimListApproval_SC.Claim_amount and pass the xml to stored procedure and do the manipulation

--If i pass string it works fine and in stored procedure i have to use the claim amount as
varchar[declare a variable claim amount as varchar]...and the xml that we fetched which contains claim amount we store it in the variable declared ...and do the manipulation

--I was just thinking like pass decimal value from front end....and pass the xml to stored procedure ....and in stored procedure[declare a variable claim amount as decimal].. and the xml that we fetched which contains claim amount we store it in the variable declared ...and do the manipulation

----But this doesnot work.....that is the doubt