how to convert string to bigint in asp.net using c#

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how to convert string to bigint in asp.net using c#.

I have taken Refid as Bigint.
So,i want to convert textbox value to BIGINT

SQL

Query = "select * from demo where Refid=" + __________(TextBox1.Text);

Posted 1-Jan-13 21:24pm

maan_k

Updated 1-Jan-13 23:14pm

Herman<T>.Instance

v2

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7 solutions

Solution 2

You query is going to work just fine without any conversion. Just make sure that the value entered in the textbox is validated before sending to the query.

Posted 1-Jan-13 21:41pm

Zafar Sultan

Comments

Herman<T>.Instance 2-Jan-13 5:15am

he can use string.format to assist him:
Query = string.Format("select * from demo where Refid={0}", TextBox1.Text);

Solution 3

Hi,

You can use the following things for conversion.

C#

textboxvaluehere.ToInt64();
Convert.ToInt64(textbox value here);

Int64.Parse(textbox value here);
Int64.TryParse(your textbox value, out parameter);

Use any one of these method and you will get the integer to be parsed. But remember that your textbox contains a valid input.

Thanks

Posted 1-Jan-13 23:23pm

sisir patro

Updated 1-Jan-13 23:24pm

v2

Solution 5

I think you no need to convert string to bigint.

C#

Query = String.Format("select * from demo where Refid={0}" ,TextBox1.Text)

Posted 2-Jan-13 1:43am

Tharaka MTR

Solution 6

hi,

Use this one :-

Int64 refId=0;
Int64.TryParse(TextBox1.Text, out refId);

Posted 2-Jan-13 2:09am

Aditya Magotra

Solution 7

You can use either Int64.TryParse or Convert.ToInt64

Posted 2-Jan-13 2:29am

rahulkasar

Solution 4

Try this

C#

Query = "select * from demo where Refid=" + Convert.ToInt64(TextBox1.Text);

Posted 1-Jan-13 23:24pm

magiccoder

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Abhinav S · Accepted Answer · 2013-01-01T21:28:00

Solution 1

It is easiest to use Convert.ToInt e.g. select * from demo where Refid=" + Convert.ToInt64(TextBox1.Text); .

However, this can be a problem if you are not sure if the string is an integer.
In this case, you can consider using Int64.TryParse[^].

Posted 1-Jan-13 21:28pm

Abhinav S