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You can obtain the SHA1 of the most recent commit in a Git repository using C# by executing the following command in a console window:

git rev-parse HEAD

To execute this command programmatically using C#, you can use the Process.Start() method to start a Git process and read the output:

using System.Diagnostics;

var processStartInfo = new ProcessStartInfo("git", "rev-parse HEAD")
{
    RedirectStandardOutput = true,
    UseShellExecute = false
};

var process = Process.Start(processStartInfo);
var output = process.StandardOutput.ReadToEnd();
process.WaitForExit();

var sha1 = output.Trim();

The RedirectStandardOutput property is set to true to redirect the output of the Git process to a stream that can be read in the application. The UseShellExecute property is set to false to run the Git process without a shell. The StandardOutput property of the Process object is used to read the output from Git. The WaitForExit() method is called to wait for the Git process to finish executing before reading the output. The Trim() method is used to remove any extra whitespace from the output, which will result in the SHA1 of the most recent commit in the Git repository.