hi guys what is the meaning of String.Format("EXEC {1}",...)

Full details are on MSDN: String.Format method[^]

But in essence, String.Format takes a variable number of parameters (one or more) and returns a string made up from the various parts you give it.
It you pass it two or more parameters, the first one must be a string, and controls how the others are used. If any part of the string is enclosed in '{' and '}' then it refers to the other parameters, and will be substituted. Normally, the contents of the '{' and '}' pair is a numeric refenece by parameter number, satrtign from zero, but it can also contain formatting information for that parameter.

For example

String.Format("EXEC {0} /INDEX={1}", "ProgramName", 123);

would return a string:

"EXEC ProgramName /INDEX=123"

I think he's asking about the {1}

If that's the case, then take a look at the String.Format Method (String, Object)[^]

Hope it helps

Ah sorry, im asking about the EXEC