Input string was not in a correct format.

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SQL

UpdateCommand.Parameters.AddWithValue("@post", SqlDbType.VarChar).Value = Convert.ToInt32(textBox7.Text.Trim());

Posted 8-Mar-15 23:12pm

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[no name] 9-Mar-15 5:14am

What do u get in textBox7.Text ?

[no name] 9-Mar-15 5:15am

number value

Rajesh waran 9-Mar-15 5:17am

Your @post Sqldbtype is varchar,but you are passing integer value to it. Check it out.
Also you have to check textbox value. Bcoz you are using Convert.Int32() so you have to check that textbox values is in integer or not?

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Afzaal Ahmad Zeeshan · Accepted Answer · 2015-03-08T23:27:00

You should try this code instead, to make sure this error goes away.

C#

int number;
if(int.TryParse(textBox7.Text.Trim(), out number) {
    // If the number can be parsed
    UpdateCommand.Parameters.AddWithValue("@post", SqlDbType.VarChar).Value =       
    Convert.ToInt32(number);
}

Above code would check if the number can be converted, if it can be then it would execute the code block and the number would have the value that was converted from string to int. Also, the error won't occur, since you would execute the code only if the type is number.

Also as mentioned, you would also need to change the type of your data being passed to the database.

Int32.TryParse[^], Convert.ToInt32[^] on MSDN.

anand vemuri · Accepted Answer · 2015-03-08T23:32:00

Solution 2

C#

//will get the error while converting empty string to int, so make the condition accordingly 
if(textBox7.Text.Trim() != null || textBox7.Text.Trim() != String.Empty)
{
UpdateCommand.Parameters.AddWithValue("@post", SqlDbType.VarChar).Value =   Convert.ToInt32(textBox7.Text.Trim());
}

Posted 8-Mar-15 23:32pm

anand vemuri

Updated 12-Mar-15 1:29am

v2